Tongue cancer can be detected clinically through medical history, symptoms and relevant examination. 1. Medical history: People with long-term poor oral hygiene, malnutrition, smoking, drinking and betel nut consumption should be alerted to tongue cancer. 2. Symptoms: Tongue cancer patients mainly manifest tongue pain, tongue erosion, restricted tongue movement, difficulty in chewing, slurred speech, bad breath, salivation (drooling) and enlarged submandibular and cervical lymph nodes. 3. Relevant examination: If oral examination reveals that the patient has symptoms such as white spots, tongue ulcers, and pain when touching the tongue, the patient should be alerted to tongue cancer. Those who have abnormal oral examination results need to do blood routine, maxillofacial CT scan, magnetic resonance imaging, ultrasonography, oral X-ray, endoscopy and so on. Taking tissues from lesions for histopathological examination is the gold standard for confirming the diagnosis. It is recommended to consult regular hospitals for examination to clarify whether tongue cancer is present or not, and actively cooperate with doctors for treatment after diagnosis of the disease.