You can over massage. Massage works toxins, waste and metabolites out of soft tissue and moves it into the lymph and blood stream for elimination in the normal fashion. If a lot of toxins and waste are moved out of tissues and either you don't drink enough water to eliminate them or it's more than your body can eliminate in that short time, the waste and toxins settle back into your tissues. At the least this will cause you to feel sore or at the worst, feel like you have the flu. Always drink plenty of water or coconut water after a massage. And just in case you're wondering, beer does not count as water. I know you're disappointed but I don't make the rules.
Nice to meet you too, BOZ