Swollen Feet in Pregnancy: Causes, Changes to the Arch and Safe Foot Care

What lies behind it

Swollen feet during pregnancy are primarily the result of a finely tuned interplay between hormonal changes, altered pressure conditions in the vascular system, and a significantly increased blood volume. From the first trimester onwards, the blood volume of the expectant mother increases by up to 40 to 50 percent. This increase mainly affects blood plasma, which alters blood flow properties and increases fluid pressure in the capillaries. At the same time, the hormone progesterone causes dilation and relaxation of the vein walls. The veins lose tone, which impairs the return transport of blood from the lower extremities to the heart.

In addition, the steadily growing uterus in the pelvic cavity exerts direct mechanical pressure on the inferior vena cava. This backpressure extends into the small veins and capillaries of the legs and feet. Due to the increased hydrostatic pressure, liquid blood components leak into the surrounding connective tissue. Medical professionals refer to this as interstitial oedema. These fluid accumulations follow gravity and are therefore particularly pronounced on the dorsum of the foot, the ankles, and the lower legs.

In addition to pure oedema formation, a biochemical restructuring of the musculoskeletal system takes place. The hormone relaxin is secreted in elevated concentrations. Its main biological task is to soften the ligaments and tendons in the pelvic area to render the birth canal flexible. However, relaxin does not act locally alone, but systemically throughout the entire body. Accordingly, the ligamentous support structures of the foot also become more flexible and yielding.

The human foot skeleton possesses two main arches: the longitudinal arch on the inner side and the transverse arch in the forefoot area. These arches are stabilised by a complex network of ligaments, such as the long plantar ligament (ligamentum plantare longum), the plantar fascia, and supporting muscles. If these ligamentous structures loosen under the influence of relaxin, combined with continuously increasing body weight, the arch of the foot gives way. The foot flattens and spreads in both length and width. A collapse of the longitudinal arch leads to a functional flat foot, while the yielding of the transverse arch promotes a splayfoot.

Typical signs

The most characteristic symptom of fluid accumulation is pitting oedema. If light pressure is applied with the thumb for a few seconds to the swollen dorsum of the foot or the shin bone, a visible dent remains, which refills only slowly. Affected individuals usually report a feeling of heaviness and tension in both feet. The skin appears smooth, shiny, and is more sensitive to friction. Socks leave distinct indentations, and shoes that fitted without problems at the start of pregnancy press painfully against the toes or instep.

Due to the mechanical collapse of the foot arches, the entire gait pattern changes. The contact area increases, which often requires shoes to be chosen one to two sizes larger. Overloading the overstretched plantar fascia frequently manifests as sharp heel pain, which occurs particularly during the first steps in the morning. Pressure also shifts to the forefoot, promoting the development of calluses under the metatarsal heads.

It is essential to distinguish these physiological adaptations from pathological conditions. Symmetrical swelling of both feet, which partially regresses after elevating them overnight or following mild cooling measures, is considered typical. However, if swelling occurs suddenly, massively, or exclusively in a single leg, the finding requires medical investigation. Unilateral swelling accompanied by calf or popliteal pain, warmth, and redness of the skin may indicate deep vein thrombosis. If oedema increases abruptly and also spreads to the hands, face, and eye area, medical diagnostics must be carried out immediately.

Everyday causes

In daily life, various factors act as accelerants for swollen feet during pregnancy. Prolonged, uninterrupted standing or sitting is paramount. In these positions, the calf muscle-vein pump remains inactive. When contracted, the calf musculature compresses the deep veins and essentially pumps blood towards the heart. If this pumping mechanism fails, blood rapidly accumulates at the lowest points of the body due to gravity.

Inappropriate footwear significantly exacerbates the problem. Tight, rigid shoes impede the natural rolling movement of the foot, inbalancing the calf muscle pump. Flat ballerina flats or flexible canvas shoes without a supportive footbed provide no support to the capsule-ligamentous apparatus softened by relaxin. The foot arch collapses unhindered under the load. On the other hand, high heels lead to shortened calf muscles and extreme overloading of the forefoot.

Thermal influences also play a role. Warm summer conditions or excessively hot baths lead to peripheral vasodilation, the widening of superficial blood vessels. As a result, even more fluid pools in the tissue. An underestimated factor in daily life is altered posture. Due to the forward shift in weight, lumbar lordosis increases. This change in alignment tilts the pelvis and alters the angle of the legs, negatively affecting pressure distribution on the sole of the foot and venous return flow.

Finally, limited reach to the feet in the final trimester leads to care errors. When trimming nails becomes anatomically difficult, toenails are often rounded off diagonally or cut too deeply at the sides. Due to swelling of the toe segment, the remaining nail edge quickly presses into the softened nail fold. A painful inflammation ensues, an unguis incarnatus (ingrown toenail), which can become chronic without professional care.

When medical assessment is required

Pregnant women should carefully monitor changes to their legs and feet. While moderate, uniform oedema is usually harmless, certain warning signs require immediate consultation with a specialist in gynaecology or emergency medicine.

A sudden, extreme increase in fluid retention within a few hours or days is the key symptom of pre-eclampsia. This condition, formerly known as pregnancy gestosis, represents a serious complication. Medical evaluation is imperative upon the appearance of the following symptoms:

• Sudden increase in oedema on the feet, legs, hands, and face
• Blood pressure values persistently above 140/90 mmHg
• Severe, persistent headaches or visual disturbances and flickering before the eyes
• Pain in the right upper abdomen, as well as nausea and vomiting
• Unilateral swelling of a leg with pain, tension, redness, or localized heat

Unilateral findings indicate an increased risk of thromboembolism, which is fundamentally elevated during pregnancy due to altered blood coagulation. Early investigation protects mother and child from severe complications.

What podiatric treatment can achieve

A qualified podiatry practice provides a safe interface between medical prevention and targeted relief throughout pregnancy. At the centre is professional foot care tailored precisely to the altered anatomical conditions. When one's own reach diminishes, the podiatrist takes over the professional shortening and smoothing of the toenails. Here, the nail is trimmed strictly straight and only gently softened at the corners to effectively prevent ingrowing into swollen tissue.

If an ingrown nail or inflamed nail fold has already occurred, gentle corrective techniques are applied. The nail brace technique, also known as orthonyxia, represents a painless alternative to surgical procedures. An individually fitted spring steel wire or plastic brace is fixed onto the nail. It gently lifts the nail edges out of the inflamed fold and provides immediate pain relief. Patients can obtain a comprehensive overview of therapeutic options via our services.

Another focus lies in the removal of excessive hyperkeratosis and corns. Due to altered mechanics and the collapse of the transverse arch, localised pressure peaks occur on the balls of the feet and heels. Under sterile conditions and with a trained eye, the specialist precisely removes hyperkeratosis using scalpel techniques or rotating diamond burs. Treatment is painless and adheres strictly to medical hygiene standards, which are transparently documented on our page regarding hygiene.

Furthermore, podiatry offers custom relief options. Custom silicone orthoses can be manufactured for pressure points caused by toe deformities or friction-related complaints. These durable custom pieces redistribute pressure and protect sensitive skin areas. Professional advice regarding compression-supporting measures and shoe modifications is also part of the scope. As a sectoral practitioner in podiatry (sektorale Heilpraktikerin für Podologie), Helga Maria Freitag possesses the qualification to independently diagnose functional complaints and create targeted treatment plans without prior physician referral.

A podiatric session usually lasts 30 to 45 minutes. In the final trimester, a treatment interval of three to four weeks is recommended to consistently prevent ingrown nails and the formation of pressure points. On our about me page, you can learn more about the professional background and specialisations of our practice management.

What you can do yourself

For daily foot care with swollen feet and restricted mobility due to the pregnancy bump, there are a number of proven strategies. When bending down is no longer possible without shortness of breath or pain, the care routine must be adapted. The principle of accessible care applies, utilising assistive devices and simplified procedures.

To relieve the veins and gently drain oedema, you should regularly integrate the following measures into your daily routine:

• Elevate your legs several times a day for 15 to 20 minutes. A position where the feet are slightly above heart level is ideal. A wedge pillow or raised sofa cushions provide stable support.
• Use long-handled aids for washing feet, such as a sponge with a telescopic handle, to avoid arduous bending in the shower.
• Take foot baths at a lukewarm temperature, with a duration not exceeding ten minutes. Sea salt added to the water has a mild dehydrating effect on the upper skin layer.
• Activate the calf muscle pump while sitting or lying down. Rotate your feet 15 times inwards and outwards, and alternately pull your toes firmly towards your shins and extend them downwards.
• When buying shoes, ensure a wide toe box, a stable heel counter, and adjustable Velcro or lace fastenings that adapt to fluctuating swelling levels throughout the day.

A typical case study from podiatric practice illustrates the benefit of structured self-initiative. A patient in her 34th week of pregnancy complained of severely burning soles and painful pressure points on the forefoot. Inspection revealed a collapsed transverse arch and incipient calluses under metatarsal heads II and III. Through a combination of professional callus removal, daily application of 5 percent urea lotion using a long-handled lotion applicator, and consistent wearing of flat, cushioned shoes with an elastic insole, the patient was able to walk pain-free within two weeks.

Caution is advised when choosing care products. Highly concentrated urea preparations over ten percent should only be used during pregnancy after consulting a professional, as the softened skin barrier reacts more sensitively. A moisturizing emulsion with nourishing plant oils such as almond oil or jojoba oil effectively protects stressed, taut skin from cracking.

Common mistakes

In practice, well-intentioned but counterproductive measures taken by pregnant women are observed time and again. A widespread mistake is resorting to ice-cold foot baths or ice packs. Excessive cold causes abrupt constriction of blood vessels. The body responds with a reflexive counter-regulation: the blood vessels subsequently dilate even further, intensifying fluid retention. The water temperature for relieving baths should therefore always remain lukewarm, between 32 and 35 degrees Celsius.

Another error involves trimming the nails. When the view of the toes is obstructed by the abdomen, many women blindly reach for nail scissors or clippers. In doing so, nail corners are often cut round to avoid bumping inside the shoe. Exactly this rounding causes the growing nail to pierce into the deeper tissue layers of the swollen nail fold. An ingrown nail should always be prevented by a straight transverse cut instead.

Wearing overly tight, cutting socks is another problem. Socks with tight elastic bands act as a constriction point at the ankles or calves. They interrupt lymphatic and venous return flow, which drastically worsens swelling in the foot area. Only medical compression stockings prescribed by a physician and precisely measured at a medical supply store, or vein-tested socks without cutting elastic, should be used.

Likewise, an increased shoe size tempts many women to switch to unpadded slip-ons, clogs, or slides without heel support. In such shoes, the toes perform a clawing motion with every step to keep the shoe on the foot. This leads to massive strain on the tendons of the toe flexors and extensors, promotes hammer toes, and additionally overloads the plantar fascia.

Finally, the indiscriminate use of over-the-counter, strongly diuretic tea blends or diuretics without medical advice is dangerous. Abrupt pharmaceutical or herbal fluid removal deprives the maternal vascular system of fluid, further thickening the blood and potentially compromising placental perfusion. Oedema treatment during pregnancy always belongs in the hands of trained medical personnel.

Current evidence and classification

The scientific literature convincingly demonstrates that changes to the foot during pregnancy are not a temporary phenomenon, but can have lasting structural consequences. A landmark study by Segal et al. investigated the morphological changes in the human foot during and after pregnancy. The researchers demonstrated that the collapse of the longitudinal arch and the increase in foot length persist in the majority of primiparous women even months after delivery [1]. The flattening of the arch leads to a permanent alteration in pressure distribution under the sole.

Studies on the effect of the hormone relaxin clarify the biochemical mechanism. Relaxin binds to specific receptors in ligaments and tendons, leading to a reduction in the tensile strength of collagen fibres. Combined with the mechanical pressure of weight gain, altered micromechanics occur in the foot joints [2]. This finding underscores the necessity of supporting the arch of the foot during pregnancy through stable, well-cushioned footwear to prevent irreversible deformation.

Regarding the treatment of pregnancy oedema, a meta-analysis of Cochrane reviews demonstrates that non-pharmacological interventions such as moderate water exercise, intermittent pneumatic compression, and wearing class I or II medical compression stockings can significantly reduce swelling [3]. Compression stockings increase tissue pressure from the outside, reducing fluid leakage from capillaries and promoting return flow.

Studies on the effect of manual lymphatic drainage and reflexology in pregnancy-related leg oedema also show positive effects on quality of life and circumference measurements [4]. A comparative study demonstrated that even a 20-minute gentle podiatric or physiotherapeutic relief treatment measurably reduces the subjective feeling of heaviness and ankle circumference. The evidence clearly supports a combination of functional support, professional care, and moderate exercise.

Treatment in Memmingen

For expectant mothers in the Allgäu, Unterallgäu, and Oberschwaben region, FREITAG® Podologie GmbH offers professional and empathetic care. In our modern practice at Kempterstr. 25 in Memmingen, we specialise in the needs of sensitive feet. The premises are barrier-free and offer maximum comfort for pregnant women in every trimester.

Owner Helga Maria Freitag combines many years of experience as a state-recognised podiatrist and sectoral practitioner (sektorale Heilpraktikerin) in podiatry with a deep understanding of functional changes in the musculoskeletal system. We take ample time for your assessment and tailor every treatment precisely to your current week of pregnancy. Contact us directly via our contact page or visit the overview of our practice to find out about available appointments and procedures.