Bleeding gums are caused by many reasons, a common cause is chronic inflammation of the gums, so bleeding gums are mostly seen in patients with periodontitis and gingivitis, and we can further check patients with bleeding gums by examining periodontitis and gingivitis. Self-examination of periodontitis: 1. Blood on the bristles when brushing teeth and blood on food when biting food indicates gingivitis. 2, look in the mirror, if there is redness and swelling of the gums and bleeding when touched, it means there is gingivitis. 3.The teeth have different degrees of looseness, the roots are exposed or the gums are red, swollen and have pus, indicating that periodontitis has developed. 4, there is bad breath indicates that there may be periodontitis. The simple way to check gingivitis is to observe the color and texture of the gums and the presence of bleeding; normal gums are pink, soft and dense in texture, and dotted with color on the surface. If the gums are dark red, soft and swollen, with no color on the surface, and bleed easily when eating, brushing, or touching, then the diagnosis of gingivitis can be made. In addition to the above-mentioned signs, some patients have conscious symptoms of itchy, swollen gums and bad breath. Blood: Healthy gums do not bleed when brushing or probing the gingival sulcus. In gingivitis, bleeding occurs with light touch and on probing. Bleeding after probing is an important objective indicator for diagnosing the presence or absence of inflammation of the gums.