Humidity, if the humidity is high that could do it. If you mean very warm, the inability to cool upper airways (as they warm air for lower airways) can do it. If tropical or fertile, can be pollens/ molds. If desert, can be dusts (or still molds/pollens). If a firefighter—might be smoke & toxic gasses. Unfortunately, many options means need good history and exam to narrow down and diagnose properly.
POSTED BY: Steven Ajluni, MD