For Ananda
sometimes chemical poisoning can emulate symptoms that look like something like a cold or flu.
http://extoxnet.orst.edu/tibs/manifest.htm
Table 1. General toxicity categories
Category System affected Common symptoms
respiratory nose, trachea, lungs irritation, coughing, choking, tight chest
gastrointestinal stomach, intestines nausea, vomiting, diarrhea
renal kidney back pain, urinating more or less than usual
neurological brain, spinal cord headache, dizziness, behavir confusion, depression, coma, convulsions
hematological blood anemia (tiredness, weakness)
dermatological skin, eyes rashes, itching, redness, swelling
reproductive ovaries, testes fetus infertility, miscarriage