Stress lumps
Stress lumps are a colloquial (slang) term that refers to the medical condition of enlarged lymph nodes. The term stress lumps is more commonly used so as to differentiate between serious forms of lymph node swelling, which could indicate lymphoma (cancer), leukaemia (cancer) or other forms of lymphocitis, which are very serious. Stress lumps, in comparison, are not serious and will usually go away by themselves in a few hours, or a day or 2 at worst.
Homer Simpson had stress lumps when he turned into the Hulk.