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Hisam Siddiqi: Night Sweats Are Not Always a Hematological Plot Twist
Mar 10, 2026, 12:59

Hisam Siddiqi: Night Sweats Are Not Always a Hematological Plot Twist

Hisam Siddiqi, Consultant Haematologist at LycaHealth, The Blackheath Hospital, Dartford and Gravesham NHS Trust, shared a post on LinkedIn:

”Night Sweats: Not Always a Haematological Plot Twist

One of the most common reasons patients end up in our clinics is the humble night sweat – the kind that soaks the sheets and sparks a full WebMD-fuelled existential crisis by morning.

But here’s the twist: most night sweats have absolutely nothing to do with haematological malignancy.
(Shockingly, not everything is lymphoma… though we all secretly enjoy the diagnostic puzzle.)

Night sweats can spring from a whole spectrum of causes: infection, endocrine issues, neurological conditions, connective tissue disorders, menopause, sleep apnoea, diabetes – you name it. Haematological causes sit quietly in the corner, waving politely.

Useful initial tests include:

  • FBC and blood film
  • ESR / CRP
  • TFTs
  • Glucose
  • Viral serologies (EBV/CMV/HIV/Hep)
  • Immunoglobulins
  • CXR
  • Lymph node and spleen examination

When to refer:

  • Systemic red flags (weight loss, fevers, alcohol-induced pain)
  • Lymphadenopathy or splenomegaly
  • Abnormal FBC (always worth a chat with your friendly haematologist)

Who doesn’t need referral?

Patients with only night sweats and a normal FBC

Let’s keep referrals appropriate, patient pathways smooth, and everyone’s bedding as dry as possible.”

Hisam Siddiqi: Night Sweats Are Not Always a Hematological Plot Twist

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