Overview
Plantar fasciitis is a common cause of pain under the heel and along the bottom of the foot. It involves irritation and degeneration of the plantar fascia, a tough band of tissue that supports the arch and helps control foot mechanics when you walk. Pain often feels sharp with the first steps in the morning because the tissue has been relatively still and becomes more stressed as you start moving. With activity, the discomfort can persist or return, especially after standing or walking.
Symptoms
The most typical symptom is pain at the bottom of the heel, often closer to the inner side, that may spread slightly into the arch. Many people notice it is worst with the first steps after getting up and then eases somewhat as the foot "warms up," but it can flare again after prolonged standing, walking, or running. The area is usually tender to touch, and the foot may feel stiff during the early part of activity. In some cases, discomfort can limit walking distance and make it harder to stay active.
Causes
Plantar fasciitis usually develops from overuse and repeated stress on the plantar fascia. Tight calf muscles, limited ankle flexibility, sudden increases in activity, poor footwear support, or changes in running and walking mechanics can overload the fascia faster than it can recover. The condition can be worsened by prolonged standing or an increase in body weight, and it may be more likely when the arch collapses or the foot rolls inward.
Risk Factors
Risk is higher in people who have jobs or activities that involve long periods of standing or frequent walking on hard surfaces. Tightness in the calves and reduced ankle flexibility, high arches or flat feet, and rapid increases in training or activity can all contribute. Being overweight can increase the load on the plantar fascia, and inadequate footwear or worn-out shoes may reduce shock absorption.
Prevention
You can lower the chance of developing plantar fasciitis by avoiding sudden jumps in walking or running distance and by building activity gradually. Supportive footwear, replacing worn shoes, and using appropriate arch support can reduce stress on the fascia. Regular calf stretching and strengthening of the foot and ankle, along with maintaining a healthy weight, can help prevent flare-ups. If you feel early heel discomfort, reducing load and addressing mechanics early can prevent symptoms from becoming persistent.
How the Diagnosis Is Evaluated
A clinician typically starts with a history focused on where the pain is located, when it occurs (such as first steps in the morning), and what activities make it worse. A physical exam often shows focal tenderness along the plantar fascia near the heel and may reveal limited ankle motion or calf tightness. Imaging is usually not required at first, but x-rays may be used to rule out other causes or to look for heel-related bone issues, and ultrasound or MRI may be considered if symptoms are atypical, severe, or not improving.
Nonsurgical Treatment Options
Most cases improve with conservative care. Treatment commonly begins with stretching and mobility work (especially calf and plantar fascia stretching), physical therapy for foot and ankle mechanics, and temporary activity modification to reduce the irritating load. Supportive shoes, arch supports or orthotics, and sometimes a night splint can help reduce morning pain and improve tissue tolerance. Pain control may include short-term use of anti-inflammatory medicines if appropriate for you, or other non-prescription strategies such as ice after activity. If symptoms persist, options may include corticosteroid injection for targeted pain relief, shockwave therapy for tissue healing support, or platelet-rich plasma (PRP) injection in selected cases.
When to Seek Medical Attention
Seek prompt medical attention if you cannot bear weight, if pain is rapidly worsening, or if you notice major swelling, redness, or fever. Get evaluated urgently if you have numbness, weakness, or symptoms that spread beyond the foot, or if there was a significant injury that could suggest a fracture or tendon problem. Also seek medical care if heel pain does not improve after several weeks of appropriate self-care or keeps recurring despite modifications.
Frequently Asked Questions
Plantar fasciitis usually causes sharp pain under the heel, often worst with the first steps in the morning and after prolonged standing or walking.
Most people do not need an MRI; diagnosis is usually made from your history and exam, while imaging is considered if symptoms are atypical or not improving.
Corticosteroid injections can reduce pain for some people, but they are not a guaranteed cure and should be used judiciously due to potential risks, including tissue weakening.
Next Steps
If your symptoms fit plantar fasciitis, start with supportive footwear, consistent calf and plantar fascia stretching, and temporary activity adjustments to calm the irritation. If pain is severe, you cannot bear weight, or it does not improve after several weeks of careful self-care, schedule an evaluation with a clinician or physical therapist to confirm the diagnosis and tailor treatment to your foot mechanics.