Although mild concussions are not life-threatening to the patient, they can still produce some undesirable symptoms, and the main adverse effects of mild concussions are as follows. First, a mild concussion can cause dizziness, which is not much related to the patient’s own state of motion, whether in motion or at rest. In severe cases, the patient may become unconscious or even comatose, but this condition usually does not last long. Patients may also experience hypotension and the accompanying symptoms of hypotension, such as cold sweats, pallor, and weakness of the limbs, but there is no need to worry too much, as this condition will be relieved after rest. At the same time, patients with mild concussions also experience memory loss, with varying degrees of loss of memory of the incident and its preceding events, but with rest or external stimulation, this memory will gradually return. Overall, patients with mild concussions do not have to worry too much, as long as they get some rest, these symptoms will disappear. If the reaction is severe, it is best to consult a professional doctor and follow his or her instructions.