Which of the following is NOT a symptom of high radiation doses on the gastrointestinal system?

High radiation doses can lead to significant damage to the gastrointestinal (GI) system, causing a range of acute symptoms. Nausea, vomiting, and diarrhea are all common reactions following exposure to such radiation levels due to the rapid turnover of cells in the GI tract, which makes it particularly vulnerable to radiation-induced injury.

Nausea and vomiting are often among the first symptoms experienced, as the central nervous system responds to the stress of radiation exposure. Diarrhea occurs due to the destruction of the intestinal lining, which disrupts normal absorption and leads to fluid loss.

On the other hand, hair loss is primarily associated with radiation damage to hair follicles rather than the gastrointestinal system. While it can occur as a result of high radiation exposure, it does not directly relate to the symptoms that arise from gastrointestinal damage. Therefore, it is not considered a symptom of high radiation doses specifically impacting the GI tract.