There are many reasons for a headache at 5 weeks of pregnancy, and a diagnosis cannot be made by the symptoms of a headache, but you need to be alert for serious conditions such as hypertensive syndrome of pregnancy. Diseases such as sinusitis and migraines, if present before pregnancy, may flare up to cause headaches after pregnancy. Gestational hypertension syndrome is a condition specific to pregnancy, in which high blood pressure can lead to excessive pressure in the blood vessels of the head, which may manifest as headaches. In addition, patients may experience dizziness, nausea, vomiting, blurred vision, and edema. Therefore, headache at 5 weeks of pregnancy alone cannot accurately determine the cause, but also needs to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended that when the headache persists unrelieved to consult a doctor in a timely manner, under the guidance of the doctor to clarify the cause of the disease.