Feeding tubes deliver enteral nutrition to patients unable to swallow due to dysphagia, cancer, neurological disorders (ALS, stroke), prematurity, or critical illness. Types: Nasogastric (NG) (nose-to-stomach, short-term <4 weeks, 8-16Fr polyurethane), nasojejunal (NJ) (post-pyloric for gastric intolerance), gastrostomy (PEG) (endoscopic abdominal insertion into stomach, 15-24Fr long-term), jejunostomy (PEJ/J-tube) (small intestine bypass). Inserted via pull/push techniques; flushed with water q4-6h, feeds via gravity/pump 20-80mL/hr. Complications include migration, clogging, aspiration—verify placement via pH/aspirate.