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Cramps in the toes can be the result of a deficiency in potassium. When cramping is severe or occurs frequently, it can be a sign of a deficiency of important minerals or vitamins. A muscle cramp, or spasm, occurs when one of your muscles involuntarily contracts strongly and doesn't relax right away.
Rheumatoid arthritis can cause inflammation in the joints in the foot that lead to calluses and ulcerations, and it can cause deformity of the toes. Here's an overview to the conditions that can cause toe problems.