Feeling something wandering in the back is often caused by the following reasons: 1. There may be rheumatic diseases. If the patient has rheumatism or rheumatoid arthritis, it may cause wandering pain around the body during its onset. 2. There may be parasites under the skin. If the patient is infected with parasite eggs through the gastrointestinal tract or wounds, they may hatch under the skin, which may cause the worms to travel under the skin. At this time, the patient may feel something crawling and wandering on the back.3. There may be parasites crawling on the body surface, such as a large number of fleas or other parasites crawling inside the patient’s clothing, which may also make the patient feel this way.4. It may be caused by a Qi disorder as mentioned in Chinese medicine, for example, because the patient has had emotional fluctuations in the recent past, resulting in Qi stagnation, which may produce fever in the For example, because the patient has had mood swings in the recent past, resulting in Qi stagnation, there may be swelling and a wandering sensation in the quarter ribs and lower back.