Dizziness after a head fall for twenty days may be related to poor sleep or may be caused by concussion, anxiety and depression. 1. Poor sleep: If a head fall is caused by an accident, the patient may be frightened, resulting in too much mental tension, thus causing interference with sleep, decreased sleep quality and insufficient sleep time, which may cause dizziness twenty days after the head fall. 2. Concussion: Some people may suffer from concussion after a fall on the head, at that time, there may be consciousness disorder within half an hour, and then recover on their own. Some people with concussions may show signs of dizziness twenty days after a head fall. 3. Anxiety and depression: after a head fall, patients often worry, anxiety, poor sleep, resulting in poor mental state, may show dizziness twenty days after a head fall. Dizziness after a head fall for twenty days may also be caused by other reasons. If the symptoms of dizziness are serious, or accompanied by other discomforts, you should seek medical treatment as soon as possible to determine the cause and then give targeted treatment.