Constant leg pain can be caused by several conditions, such as fibromyalgia, varicose veins, deep vein thrombosis and superficial thrombophlebitis, according to Mayo Clinic. The chronic leg pain sometimes results from overuse, muscle injuries, blood clots, wear and tear, and problems in a patient's spine as well.
Fibromyalgia is a chronic disorder that causes widespread pain along with memory, sleep, mood and fatigue issues, according to Mayo Clinic. Its most prominent symptom is the widespread musculoskeletal pain that is described as a constant ache lasting for more than three months. Varicose veins are enlarged veins that are usually a cosmetic concern, but many patients also experience aching discomfort or pain. Patients who have this form of varicose veins report feeling a heavy ache, cramping, throbbing or swelling in the lower legs.
Deep vein thrombosis occurs when a thrombus, or a blood clot, develops in the deep veins of the body, reports Mayo Clinic. When the affected vein is near the skin's surface instead of deep within the body, it causes superficial thrombophlebitis. Both conditions usually form in the legs. Signs and symptoms of deep vein thrombosis include a swelling in the affected leg and pain that often begins in a patient's calf and feels similar to soreness or cramping. Common treatments for these conditions include blood thinners and clot-dissolving medications.