The crossword solution for the term 'It Might Give You a Headache' is 'ILLNESS, ' which is seven letters long. ILLNESS is a broad term that can refer to any physical or mental condition that causes discomfort, pain, or distress. It can range from minor ailments such as the common cold to more serious conditions such as cancer. Headaches are one of the most common symptoms of ILLNESS, and can be caused by a variety of factors, including stress, dehydration, and certain medications.