Patients appear dizziness and nausea when they are tired, the reasons are mainly considered the following aspects: 1. When people are tired when they are not able to recover in time, resulting in low blood sugar level and elevated blood pressure in the body, which can easily cause patients to have symptoms of dizziness and nausea. This situation can generally be relieved after the patient replenishes energy or rests. Patients should usually pay attention to avoid overexertion to avoid inducing acute cardiovascular and cerebrovascular diseases; 2. Patients with dizziness and nausea when they are tired should also consider the possible relationship with cervical spondylosis or with cerebrovascular spasm. If the patient appears in the case of low head and prolonged ambulatory work, it should be considered that it is caused by vertebral artery type cervical spondylosis. If the patient is elderly and there is cerebral vascular stenosis, when exertion may induce vasospasm, resulting in insufficient blood supply to the brain, the patient may also have dizziness and nausea symptoms.