Leg muscle pain can occur due to overuse, muscle strain, dehydration, or mineral deficiencies such as low potassium, calcium, or magnesium. It may also be related to conditions like muscle strain. You can try resting the affected leg, doing gentle stretching, staying well hydrated, and applying a warm compress to relax the muscles. Mild pain-relief medicines may help if needed. Maintaining a balanced diet and regular exercise can also prevent muscle pain.