Brief Answer: Diclofenac could to cause severe leg cramps. Detailed Answer: Hello, Thanks for your query. Taking diclofenac could not cause severe leg cramps. These are often caused by overuse, dehydration, or nutritional deficiencies. Following measure will help- *Drink fluid-An electrolyte imbalance can be the cause of muscle spasms, so rehydrating with an electrolyte drink can help restore balance. *Stretch the affected muscle with a mild, static stretch. *Use ice to numb the pain in a cramp, reducing inflammation and allowing the muscle to relax. *Bring the affected muscle into a relaxed position and apply direct compression to the cramp. These cramps at times may be associated with POTASSIUM deficiency and so foods such as bananas, potatoes, prune juice and dried fruit are to be taken as dietary supplement. Also, calcium fortified foods like seafood and fish, almonds, flaxseed, oats, prunes, sesame seeds, tofu and XXXXXXX can help to stave off muscle pain & spasm. Avoid acidic foods and drinks like tomatoes and vinegar which blocks the body’s natural ability to absorb calcium leading to muscle aches & muscle fatigue. I do hope that you have found something helpful and I will be glad to answer any further query. Take care

---