No bowel movement for three days is often temporary, but the approach should be structured. In the first 24–48 hours, aim to “soften and stimulate”: (1) increase fluids throughout the day, (2) add soluble fiber gradually (oats, chia, psyllium), (3) take short walks, and (4) build a morning routine—many people respond after breakfast due to the gastrocolic reflex. Warm fluids may help some individuals. Avoid excessive straining; it can worsen hemorrhoids or fissures. Seek urgent care if you have severe abdominal pain, vomiting, marked abdominal distension, fever, blood/black stools, new severe constipation, or inability to pass gas. For people with recurrent constipation, guidelines often place fiber plus osmotic agents (e.g., polyethylene glycol; in some cases magnesium oxide) as step options—yet kidney disease, arrhythmias, pregnancy, or multiple medications require clinician/pharmacist guidance. If constipation persists beyond a week or recurs frequently, evaluate contributors such as thyroid dysfunction, iron/B12 issues, medications, or pelvic-floor dysfunction.