Your gut and nervous system are constantly communicating. That is one reason digestion can change during stressful seasons.
Stress can change gut rhythm
Some people become constipated under stress. Others notice urgency, looser stools, reflux, nausea or bloating.
Do not assume it is only food
Food can matter, but stress, motility, hormones, medications, infections and medical conditions can also matter.
Track timing
Note when symptoms happen, sleep quality, cycle day, bowel pattern and meals. This can help avoid guessing.
Know the red flags
Blood in stool, unexplained weight loss, severe pain, persistent vomiting or sudden serious symptoms should be assessed urgently or by a physician.