Thinner stools for weeks, soft stools lately and sometimes (very rarely) diarria & constipation. More movements lately?

Work up. A change I'm bowel habits including diameter of stool, frequency/constipation should be handled with care since they could be related to GI tumors. Depending on your age you could be due for a colonoscopy. Knowing more about your history would be helpful since there are other differential diagnosis.