Different individuals react differently. I get red eyes and headache. I feel disoriented sometimes. Another person has severe running nose blowing every few minutes. Some people have soft stool. If you are exposed long time and you have sickness, mold can affect those who are weak. It can cause active infection and even worse.
It is difficult to diagnose from my experiences with doctors and specialists. I have been exposed to Stachy, Chaetomium, Cladosporium, Aspegillus, and Penicilium. They are brothers in arm. Wherever you find Aspergillus and Penicilium, others follow.
Control moisture and leaks, you can control mold problems.