By Anne Marie Helmenstine, Ph.D. Lipids are a diverse group of fat-soluble biological molecules. Here is a look at different types of lipids and where they are found.1  Triacylglycerols or Triglycerides. 2  The largest class of lipids goes by different names: triacylglycerols, triglycerides, glycerolipids, or fats.y Anne Marie Helmenstine, Ph.D. Lipids are a diverse group of fat-soluble biological molecules. Here is a look at different types of lipids and where they are found.
Lymph nodes become swollen in response to illness, infection, or stress. Swollen lymph nodes are one sign that your lymphatic system is working to rid your body of the responsible agents. Swollen lymph glands in the head and neck are normally caused by illnesses such as: 1  ear infection.
Causes of Lymph Nodes Swelling. The most common causes of swelling in the glands are infections, where the swelling may appear suddenly and may also be painful. If the swelling occurs slowly, a cancer may be the reason. The most common causes of swollen glands include the following.Infections.ther infections that can cause inflammation in the lymph nodes include tuberculosis and mononucleosis. Syphilis and other sexually transmitted diseases can also lead to this condition. Your pets can also be responsible for causing this swelling.