Headache after cold is caused by vasoconstriction, spasm or abnormal nerve discharge after cold, so you should pay attention to keep your head warm to avoid getting cold again, and drink warm water or warm drinks to accelerate blood vessel expansion and improve blood circulation. If the pain is unbearable, you can take oral analgesic drugs, such as aminogest, acetaminophen, aspirin, etc. You can take oral Chinese medicines for headache caused by wind, such as Chuanxiong Chajiao San and Yuanhu Pain Relief Tablets, etc. You can also seek acupuncture treatment from Chinese medicine to improve your headache.