Both young and old comrades may experience lower limb twitching, or cramps as the old people think of them, especially when the weather changes and gets progressively colder. If there are seasonal twitches, twitches in the middle of the process from warm to cold, people should also be alert to whether it is a problem of muscle spasm. In fact, many people do not necessarily have low calcium twitches, and clinically osteoporotic patients rarely have twitches, most of them are caused by muscle spasms or vascular spasms due to cold weather, resulting in local twitches, and of course, some elderly people are not excluded from having osteoporotic twitches themselves. If there are always lower limb twitches, do a good job of keeping warm. For the elderly, for people with poorer physique, it is actually better to do a good job of keeping warm too early and not too cold. If it cannot be relieved, it may also be helpful to take appropriate calcium supplements or use drugs that activate blood vessels, soften them, and increase peripheral circulation.