Too tight: If the hat isn't your size it might be cutting off blood flow. You also might get too hot.
Answered 12/23/2017
5.2k views
External Compression: There is a syndrome called external compression headache that is similar to what you describe. When pressure is placed on cutaneous nerves in the scalp by a helment, goggles, etc. It can cause a non-pulsating dull headaches that generally resolves with-in one hour of removing the helment, etc.
Answered 4/12/2019
5.2k views
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