<human>: hii have just come back from a holiday in italy and venice.  I have had quite a few mosquito bites in the last 7 days, and twice i have felt dizzy and light-headed (not sickness) that has lasted for approx 4-6 hours (from waking up til mid-afternoon).  could this be caused by the bites and what should i do? age 38, male, 5ft 10in, weight 14stone, take medication for high blood pressure. many thanks
<bot>: HIT hanks for posting your query to Chat Doctor.  I don't think it is due to mosquito bite unless you have fever (which can be due to mosquito bite).  There are many causes for Dizziness, from simple and easily treatable causes to serious causes. Simple causes are :1. Abnormalities in BP: Both high and low BP can cause dizziness. 2. Abnormalities in Blood sugars: Both high and low Blood sugars can cause dizziness.3. Abnormalities in blood sodium levels. 4. Low Hemoglobin (Anemia)5. Inner Ear problems. Some serious problems are :1. Heart Problems2: Brain problem My advice to you is to get your Blood pressure, Eyes and Ear examination done and if they are normal kindly get the following tests and revert to me.  Hemoglobin, Fasting and Postprandial Blood Sugars, Serum Sodium levels, Serum TSH, Serum Vitamin B12 levels checked and an ECG.  Hope you find this information useful. Any clarification feel free to ask