@tjanet upper endoscopy is not how SIBO is determined. Its determined through a 3 hour breathylizing test. How about a hernia?
You probably know this already but;
Abdominal pain that occurs primarily when standing and resolves when sitting or reclining is a classic sign of a musculoskeletal or nerve issue in the abdominal wall rather than an organ problem. Common causes include Anterior Cutaneous Nerve Entrapment Syndrome (ACNES), abdominal muscle strain, or a ventral/abdominal hernia.These conditions share the trait that gravity and upright posture tense or stretch the abdominal wall, compressing nerves or pulling on muscles, whereas reclining allows the muscles to relax.Common CausesACNES (Nerve Entrapment): Small nerves passing through the abdominal muscles can become pinched. The pain is usually sharp or burning, localized to a single spot, and worsens with movement or standing.Abdominal Wall Strain: A pulled muscle or tear in the abdominal wall where the tension of standing causes discomfort that goes away when the muscle is at rest.Hernia: A gap in the abdominal wall where tissue pushes through. A hernia often feels worse when standing or coughing due to increased intra-abdominal pressure, and may reduce or disappear when lying flat.