Foot pain and plantar fasciitis during pregnancy

By trimester

Weeks 1–13

1st trimester

Foot pain is uncommon this early since the biggest drivers, ligament laxity and added weight, haven't built up yet. If your feet already ache now, it's more likely swelling or unrelated footwear than the arch changes that show up later.

Weeks 14–27

2nd trimester

This is when measurable arch flattening begins: research modeling pregnancy-related foot changes found the greatest predicted flattening happens in the second trimester as tissue support loosens. Supportive, well-fitted shoes started now can soften what's coming.

Weeks 28–birth

3rd trimester

Plantar pressure and heel or arch pain typically peak in the third trimester, when weight gain is at its highest and the arch is at its most flattened. Elevating your feet, stretching your calves, and swapping in cushioned shoes are the standard next steps.

What does the evidence show for foot pain and plantar fasciitis?

• Rising relaxin and estrogen during pregnancy loosen the ligaments that hold the foot's arch in place, and that laxity, combined with weight gain, is linked to measurable foot pain that grows nearly twelve-fold from early to late pregnancy. 1
• Modeling of pregnancy-related foot changes found that loosened connective tissue, more than body weight alone, is what drives the loss of arch height, with the greatest predicted flattening occurring in the second trimester. 2
• A longitudinal study found that most women's foot posture shifted from a higher arch toward a flatter, more pronated shape by the third trimester, and that the flattened arch persisted into the six weeks after delivery rather than fully bouncing back right away. 3
• Heavier pressure on the front of the foot in late pregnancy is part of a broader shift in posture and gait, and one study found that by about four months after delivery, gait and balance measurements had returned to look similar to non-pregnant patterns. 4
• Heel pressure in late pregnancy was linked to low back pain in the same study of Taiwanese women, suggesting the two common late-pregnancy aches share a related mechanical cause. 1

When should I call my provider about foot pain and plantar fasciitis?

Ordinary pregnancy-related foot and arch pain is symmetric on both feet, mechanical in feel, and eases somewhat with rest, elevation, and supportive shoes. One-sided leg swelling is a different picture: more than 80 percent of pregnant people with a deep vein blood clot have symptoms in just one leg, most often the left, sometimes with a calf that measures at least 2 centimeters bigger than the other, and that combination is worth same-day evaluation rather than being written off as ordinary swelling. Numbness or a foot that feels unusually cold on one side is also worth mentioning to your provider. Whatever the pattern, any symptom that feels beyond your usual range is a reason to call: obstetric teams expect these questions and would rather hear early than late.