Blood lymphocyte count, decreased
More common causes
Tuberculosis
COVID-19 infection
Human immunodeficiency virus type 1 infection
Acquired immunodeficiency syndrome
Rheumatoid arthritis
Pancytopenia
Less common causes
Human granulocytic ehrlichiosis
Hodgkin's lymphoma
Systemic lupus erythematosus
Viral hepatitis
Ataxia telangiectasia
Intestinal lymphangiectasia
Legionella pneumophila
Aplastic anemia
Uncommon causes
Reticular dysgenesis
Human monocytotropic ehrlichiosis
Schimke immunoosseous dysplasia
Pharmacological causes
Abacavir sulfate
Abemaciclib
Abiraterone acetate
Abrocitinib
Acalabrutinib
Aldesleukin
Alectinib hydrochloride
Alemtuzumab
Alendronate sodium
Alpelisib
Antithymocyte globulin
Asciminib
Atezolizumab / hyaluronidase
Avutometinib / defactinib
Axitinib
Azithromycin monohydrate
Baricitinib
Bendamustine hydrochloride
Bevacizumab
Bortezomib
Bosutinib monohydrate
Brentuximab vedotin
Brigatinib
Cabazitaxel
Cabozantinib
Capecitabine
Carfilzomib
Cefaclor ER
Ceftriaxone sodium
Cemiplimab
Cetuximab
Chlorambucil
Chloramphenicol sodium succinate
Chlordiazepoxide hydrochloride
Citalopram hydrobromide
Cladribine
Clofarabine
Cobimetinib
Cortisone acetate
Cosibelimab
Crizotinib
Dapagliflozin / saxagliptin
Daratumumab
Daratumumab / hyaluronidase
Datopotamab deruxtecan
Deuruxolitinib
Dimethyl fumarate DR
Dinutuximab
Doxorubicin hydrochloride
Duvelisib
Eculizumab
Elotuzumab
Eribulin mesylate
Everolimus
Exemestane
Febuxostat
Fingolimod
Fludarabine phosphate
Gemcitabine
Hydroxocobalamin
Ibritumomab tiuxetan
Idarubicin hydrochloride
Idelalisib
Imatinib mesylate
Inavolisib
Inotuzumab ozogamicin
Interferon beta
Ipilimumab
Larotrectinib
Lenalidomide
Lenvatinib
Letrozole
Linezolid
Linvoseltamab
Lorlatinib
Melphalan
Methylprednisolone
Methylprednisolone acetate
Methylprednisolone sodium succinate
Miconazole
Mirdametinib
Mitoxantrone
Nilotinib
Obecabtagene autoleucel
Ofatumumab
Ofloxacin
Olanzapine / fluoxetine
Olaparib
Olsalazine
Omacetaxine mepesuccinate
Osimertinib
Oxaliplatin
Paclitaxel
Pamidronate
Panobinostat
Pazopanib hydrochloride
Peginterferon alfa-2a
Peginterferon beta-1a
Penpulimab
Pentostatin
Polatuzumab vedotin
Pomalidomide
Regorafenib
Remdesivir
Ribavirin
Ribociclib
Rifabutin
Rifapentine
Rituximab
Saxagliptin
Saxagliptin / metformin ER
Selinexor
Siponimod
Sonidegib
Sorafenib
Sunitinib malate
Taletrectinib
Telisotuzumab vedotin
Temozolomide
Temsirolimus
Terbinafine hydrochloride
Teriflunomide
Tofacitinib citrate
Upadacitinib ER
Venetoclax
Vinblastine sulfate
Vonoprazan fumarate
Vorasidenib
Zanamivir
Zanidatamab
Zolbetuximab