The cause of swollen tongue in bedridden elderly may be caused by tongue inflammation, tongue trauma, tongue allergy and other factors, which are summarized as follows. 1. Tongue inflammation: mostly seen in vitamin deficiency, the elderly long-term bedridden, tooth loss, eating vegetables, fruits and other vitamin-rich foods to reduce, easy to vitamin deficiency, thus appearing tongue inflammation, to the tongue is swollen, tongue pain as the main manifestation of the need for vitamin supplementation. 2. Other disease factors: tongue trauma, allergic diseases, etc. can lead to tongue swelling, need to be treated for the cause. In short, the bedridden elderly tongue swelling, but also need to further diagnosis and treatment, early to identify the cause of the disease, for the cause of the treatment.