Hello and welcome to HCM, AEC count is the absolute eosinophil count. The normal AEC is between 100-600/ cobic millimeter. Eosinophil count increases in various conditions. Some of these common conditions are: 1. parasitic infections e.g. tape worm infection, asciariasis, hook worm infection, strogyloidosis, etc. 2. Allergic conditions: asthma, hay fever, urticaria, etc 3. Tropical eosinophilia 4. Loefflers syndrome 5. Pulmonary eosinophilia 6. Idiopathic eosinophilia 7. Neoplastic conditions: Hodgkins lymphoma, chronic myeloid leukemia, chronic eosinophic leukemia etc. A stool examination should be done to look for any parasitic infection. After ruling out parasitic infection (which is most common cause of eosinophilia), other causes should be looked for. Shortness of breath suggests that the primary cause lies in the lungs. Is there any history of asthma? Exacerbation of allergic conditions can cause increase in eosinophil counts. Loeffler s syndrome, tropical eosinophilia are the conditions which are localized to the lungs. Treatment can be started only after the diagnosis is made. treatment is different for different causes. Consult a pulmonologist for further management. Thanks and take care Dr Shailja P Wahal