If the VA already service-connected your ibs (also called irritable bowel syndrome, functional bowel, chronic diarrhea, chronic constipation), it can cause or worsen other conditions that are ratable on their own. These "secondary" claims are where many veterans leave money on the table. Below is what a service-connected ibs commonly leads to, why, and what evidence each one takes.
A secondary claim only works if the primary condition (ibs) is already service-connected, and you have a nexus — a doctor's opinion that it is "at least as likely as not" the cause. Nexus letter sample and template →
IBS has a recognized gut-brain link; chronic, unpredictable symptoms can cause or worsen anxiety and depression (and vice versa).
What you'd need: A mental health diagnosis and a nexus opinion connecting the mood disorder to the IBS.
Chronic diarrhea or constipation from IBS strains the anorectal area, contributing to hemorrhoids and fissures.
What you'd need: A diagnosis of hemorrhoids/fissures and a note linking it to the service-connected IBS symptom pattern.
Severe IBS can impair nutrient absorption and overlaps with other GI conditions, which may be separately claimed.
What you'd need: Documented weight loss/lab findings or a co-diagnosis and a nexus opinion linking it to the IBS.