Peritoneal metastasis of gastric cancer and hypothyroidism intestinal obstruction means that gastric cancer has already had distant metastasis and appeared peritoneal metastasis symptoms; hypothyroidism leads to slow intestinal peristalsis and triggers intestinal obstruction. Gastric cancer is a malignant tumor of intestinal tract, which is easy to carry out distant metastasis through lymph node metastasis and blood line metastasis, etc. Gastric cancer invades peritoneum through lymph nodes, which suggests that the tumor has already reached the advanced stage, and the current treatments are ineffective with poor prognosis, and gastrointestinal symptoms will be combined with peritoneal metastasis. Patients with hypothyroidism have very low thyroid level, and the metabolism in the body slows down, which will affect the normal peristalsis of gastrointestinal tract and lead to paralytic intestinal obstruction easily. Patients with peritoneal metastasis of gastric cancer combined with hypothyroidism intestinal obstruction need to actively cooperate with doctor’s treatment, and it is recommended to carry out standardized treatment under professional doctor’s assessment and guidance of the condition, so as to try to improve the quality of life and prolong the survival period.