Headaches are common and can be very debilitating. Many people learn to predict and control their headaches without medical help. However, in more complex cases, medical care is essential and helps improve quality of life. Seek medical attention if your headache: Is different from the ones you usually have; Is the worst you've ever had; Has been getting worse over the last few weeks; Sudden onset and aggravation with movement, coughing or other actions; Is associated with nausea, vomiting, weakness and changes in vision, speech or behaviour; Is associated with a recent head injury or fall; Does not improve with usual treatment and continues to get worse; Interferes with your work, usual activities and quality of life. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.