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1 Common causes of heel pain include obesity, ill-fitting shoes, running and jumping on hard surfaces, abnormal walking style, injuries and certain diseases.  Plantar fasciitis is inflammation of the ligament that runs the length of the foot, commonly caused by overstretching.
Abnormally thick, cracked, and yellowing toenails may be caused by fungal infections, friction from shoes, injuries or conditions such as diabetes or psoriasis. Diabetic Foot Problems. You may have reduced sensation in your feet from diabetes, making it hard to realize that your foot is injured. Also, blood flow in your feet is impaired in diabetes, so infections can be harder to fight off. Osteoarthritis, gout, and rheumatoid arthritis are among the conditions that can cause severe foot pain.