After winter came, my leg muscles suddenly began to ache and feel weak, which has lasted for a month! What to do!

Hello, your leg is sore. The mechanism is that lactic acid produced by human metabolism can not be excreted in time, and it accumulates locally to produce irritating symptoms. It is usually caused by excessive exercise or excessive walking. Of course, when you are in poor health or weak due to illness, normal leg movements (such as walking and running) will also feel a little excessive and your legs will ache.

Suggestion:

Yes, you can go to a regular hospital for further examination. If no abnormality is found, consider whether it is caused by exercise or overwork. Take a rest for a while, see if there are still such symptoms, and then make further observation.