Is it harmful if you swallow the seeds of a Wogan citrus fruit?
Generally, accidentally ingesting a small number of Ou柑 seeds is harmless and they will pass through the digestive system naturally. However, consuming large quantities or having pre-existing digestive issues may lead to discomfort. If any abnormalities occur, medical attention is recommended. Detailed analysis is as follows:

Ou柑 seeds are small in size and relatively soft in texture, and do not contain toxic components. When a small amount enters the digestive tract, they are gradually incorporated into food residue under the action of gastric acid and intestinal peristalsis, and ultimately excreted in feces without causing harm to the body or germinating internally.
If a large quantity of Ou柑 seeds is consumed at once, the fibrous seed coats may increase the digestive burden on the gastrointestinal tract. Individuals with weaker digestion may experience discomfort such as bloating, abdominal pain, or difficulty defecating. Additionally, in rare cases, the seeds might irritate the intestinal mucosa, causing mild inflammatory reactions, or even cause blockages in narrowed sections of the intestine, although such situations are uncommon.
When eating Ou柑, try to avoid swallowing the seeds. If seeds are accidentally ingested, there's no need to panic—drinking plenty of water and consuming fiber-rich foods can help facilitate their passage. Seek prompt medical care if persistent abdominal pain, vomiting, or cessation of bowel movements occur.