Thunderclap headaches require emergent medical evaluation. Positional Headache: headache that substantially changes in intensity in association with changes in position – e.g. standing from lying or vice-versa. Headaches Initiated by Exertion: headache starting while coughing, sneezing, and/or straining.
https://americanmigrainefoundation.org/resource-library/headache-red-flags/