As you are aware white cell count is raised when the body is fighting infection. A breakdown of exactly which white cells are raised can help pin point likely sources of problem as different white cells are raised in viral, bacterial or parastical infections. A long standing allergy can also show raised white cells (eosinophils).
A comon cause of night sweats with raised white cells in young people is Glandular Fever (mononucleosis or EBV), this can be tested using the 'monospot' test. Other symptoms may include sore throat, tiredness and swollen lymph nodes.
In the more serious conditions of lymphomas there is a syndrome which we call the 'B symtoms' which includes night sweats, weight loss and fever. This is usually associated with lymph node enlargement and can also present with additional symtoms of itch, fatigue, anorexia and alcohol induced pain.
The haematologist will order more blood tests, and depending upon the clinical findings may suggest a bone marrow aspirate to examine the state of the bone marrow. Also a blood film to look for presence of immature cells.
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