Causes of cramps in the upper thigh include dehydration, pulled thigh muscles and diabetic neuropathy, according to Healthgrades. Dehydration is caused by an inadequate amount of fluids in the body, which leads to muscle cramps, notes MedlinePlus.
Dehydration occurs when a person does not consume enough fluids or loses too much fluid, explains MedlinePlus. Factors that lead to fluid loss include exercising in hot weather and having diarrhea, and a lack of fluid intake may occur when a person suffers from nausea or a sore throat. Patients with dehydration experience symptoms such as headache, thirst, rapid heartbeat and listlessness.
Pulled thigh muscles are a common injury, especially among people who participate in high-speed sports, according to the American Academy of Orthopaedic Surgeons. Symptoms of a severe thigh strain include sudden pain and a popping sensation as the muscle tears. Other symptoms include tenderness in the affected area and bruising.
Diabetic neuropathy is nerve damage caused by uncontrolled high blood glucose levels, notes Healthline. Patients with diabetes are often affected by this condition, which leads to pain, numbness or weakness in the hands or feet. Other symptoms of diabetic neuropathy include excessive sweating, pain in the extremities, nausea, diarrhea and sensitivity to touch.