Headaches in Troubleshooting your Whole30 Posted January 18, 2021 7 hours ago, APRE said: I was having the same dull headaches everyone is posting about starting on Day 12-15. I’ve been working out the same as before Whole 30. Just drank some compliant pickle juice to see if salt was the issue and the headache went away almost immediately. You could also do a salt tablet. Twice this. Got these headaches on day 13, thought it might be migraine but pickle juice was a pure miracle. If you don't have pickle juice or a tablet, slightly salted water might help as well. Never underestimate a hyponatremia (when you don't get enough sodium). Drinking water is important, but if you have changed your habits significantly it might destroy your water-salt balance (that's what happened to me - resulted in headaches).