A headache whenever you have a cold may be caused by the cold itself, or it may be caused by the presence of other underlying diseases, such as hypertension, cerebral hemangioma and so on. 1. Colds: Colds are caused by viral infections, which lead to fever, making the patient’s cranial blood vessels dilate, and the dilation of blood vessels stimulates the peripheral nerves of the vascular pain sensation, causing headaches. 2. Hypertension: If the patient’s own blood pressure is very high, it may be further caused by elevated blood pressure when he/she catches a cold, and the sudden elevation of blood pressure will easily make the cerebral blood vessels contract abnormally, which will cause headache. 3. Cerebral hemangioma: when patients with cerebral hemangioma catch a cold with fever, it will cause spasm and expansion of blood vessels, thus causing headache. If patients have headache whenever they have a cold, it is recommended that they go to the hospital in time, improve the examination, clarify the cause of the disease and follow the doctor’s instruction.