Hello, Thank you for your query. A recent illness can leave affect your immunity and leave you prone to other illnesses. It is normal to feel fatigued and have a headache when you are ill. However, if the recovery time (about 7-10 days for a cold) is prolonged, or she still feels fatigued and run down even after she gets over her cold, there could be a medical reason like anemia, thyroid problems, diabetes. poor diet, lack of sleep & rest also makes you prone to diseases. I would : examine her clinically. If there are no specific symptoms other than of a cold, I would give her appropriate treatment, advice, rest, nutritious and timely meals and extra rest. : once that is over, I would ask for a follow up to assess he general status, get a detailed family and personal medical history, analyse if she has any subtle symptoms of lingering fatigue or anemia. : if so, I would ask for the relevant blood tests and investigations (depending on her symptoms) :more often than not, there are correctable causes which can influence a person drastically especially if they are already worn out. about her current symptoms : Reducing temperatures (to normal)usually indicate healing. She should take rest and hydrate herself well (dehydration remains the silent triggers in many diseases and is not given much importance- I mean water is required for everything in our body, more so during an illness). Vitamin C may help to improve healing and immunity (avoid if she has gastritis). natural sources are better. If her symptoms worsen or she doesn t get better in a week, she should see a doctor. Hope this helps. Please get back to us for any further queries. Wish you both good health.