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Night sweats is always taken as an important symptom and would warrant search for the cause. This can be just because of the anxiety / stress and your odd working hours, still working on the cautionary side is advised. Following causes should be investigated for the night sweats, by the labs and medical imaging;
1) Lymphoma; should be looked when lymph nodes are enlarged.
2) Mycobacterial infections
3) Medications (hormonal shot)
4) Gastroesophageal reflux disease (GERD or reflux)
5) Sleep apnea
6) Idiopathic hyperhidrosis (this is excessive sweating with no determinable cause)
7) Autonomic neuropathy (involvement of the sweat nerves due to diabetes, medications etc)
8) Carcinoid syndrome (it is a tumor which secrete some chemicals in the body to cause sweating).
9) Thyroid hormone dysfunction.
Investigations needed are;
1) a chest radiograph, a PPD test, a complete blood count, TSH (for thyroid), and blood cultures.
2) a CT scan of the torso.
3) a bone marrow biopsy.
4) a 24-hour urine collection for 5-HIAA, metanephrines, and catecholamines
Please feel free for your follow up questions.