Yes, travel medical insurance is mandatory when applying for a Portugal visa. The insurance must cover at least €30,000 and should be valid for the entire duration of your stay in the Schengen Area. It should cover medical emergencies, hospital treatment, and repatriation if needed. This is an important requirement to ensure that you are financially protected in case of health issues during your travel. Without valid insurance, your visa application may be rejected, so it is important to arrange it before applying.