Swelling and pain in the head after waking up may be caused by a cold or fever, because the inflammatory response in the body increases, leading to neuronal damage in the skull and causing similar symptoms. Poorly controlled blood pressure and high blood pressure can also cause similar symptoms, because human hormones and the endocrine system play a self-regulatory role at night, which can easily cause blood pressure to rise after waking up in the morning, leading to vasoconstriction in the body, which can cause local symptoms of slight hypoxia and ischemia, causing head distension and pain. If you suffer from cervical spondylosis for a long time, the locally protruding cervical vertebrae will compress the vertebral artery, thus causing vertebral artery stenosis, which will also cause mild ischemia in the cranial area causing neuronal damage, which will also cause symptoms of head swelling and pain, and can be adjusted in time.