Elderly people have difficulty with their legs at night due to a variety of reasons, including osteoporosis, restless leg syndrome, osteoarthritis and other common causes. 1. Osteoporosis: It occurs in the elderly, mostly caused by calcium deficiency, manifested by low bone mass, damaged bone microstructure, increased bone fragility, easy to fracture and other symptoms. The lack of calcium in the body of the elderly, the thinning of the cortical bone in the joints, and the low temperature in the evening will cause the unpleasant feeling in the legs to worsen. 2. Restless Legs Syndrome: It is a kind of neurological sensory-motor disorder that mainly involves the legs. Usually, patients will have indescribable discomfort in both lower limbs at rest, which makes them want to move their legs, and the symptoms are often aggravated at night when they are resting. 3. Osteoarthritis: it occurs in the elderly, mostly caused by the wear and tear of the cartilage of the knee joints of the elderly. At night, due to the static state, it is easy to appear corresponding microcirculation function obstruction aggravation, cause knee joint ischemia, leg discomfort aggravated. Elderly people have trouble with their legs at night can also be seen in other causes, it is recommended to go to the hospital in time, to clarify the cause of the disease, timely and effective treatment, so as not to delay the condition.