Constipation is the most common lower-GI symptom but can alternate with episodes of diarrhea.
[ncbi.nlm.nih.gov]
[…] night diarrhea alternating with constipation fecal incontinence problems swallowing vomiting Autonomic neuropathy may also cause gastroparesis.
[niddk.nih.gov]
Major clinical manifestations of DAN include resting tachycardia, exercise intolerance, orthostatic hypotension, constipation, gastroparesis, erectile dysfunction, sudomotor
[ncbi.nlm.nih.gov]