10 Symptoms of Head Lice

3. Fever and Swollen Lymph Nodes

Although fevers and swollen lymph nodes are more likely to be associated with conditions such as the flu or infection, they are a common symptom of lice. Once again, fevers resulting from a lice infestation aren't caused by lice themselves, but rather their saliva and the resulting reaction by the body. In any case, the presence of swollen lymph nodes signifies a serious problem that should get checked out by your doctor. It's also good to know that not everyone develops a fever from a lice infestation. If you're not allergic to the louse saliva, your body won't trigger a fever.