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What causes fever and unintentional weight loss? 35 possible conditions

See a list of possible causes in order from the most common to the least.



Brucellosis is a rare disease usually spread through ingesting infected raw meat and unpasteurized milk. Back pain, lethargy, chills, and fever may occur and could lead to complications.

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Pulmonary Actinomycosis

Pulmonary actinomycosis is a rare bacterial lung infection. It is also known as thoracic actinomycosis. It is not contagious. This condition mainly affects people between 30 and 60 years old. It occurs more often in me...

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Infective Endocarditis

Infective endocarditis is an infection of the heart, normally caused by bacteria in the blood stream. It is a serious medical condition. If left untreated, the infection can damage your heart and may even cause death.

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Burkitt's Lymphoma

Burkitt's lymphoma is a relatively rare and aggressive form of non-Hodgkin's lymphoma, a type of cancer of the lymphatic system. It's most common in children living in sub-Saharan Africa.

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Leishmaniasis is a parasitic disease caused by the Leishmania parasite found in sand flies.

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Polymyalgia Rheumatica

Polymyalgia rheumatica is an inflammatory disorder that causes pain and stiffness in various parts of the body, including the shoulders, neck, arms, thighs, and hips. The cause of this disorder is unknown.

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Ankylosing Spondylitis

Ankylosing spondylitis is a form of arthritis that primarily affects your spine. It causes severe inflammation of the vertebrae that might eventually lead to chronic pain and disability.

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Temporal Arteritis

Temporal arteritis is a condition in which the temporal arteries, which supply blood to the head and scalp, become inflamed or damaged. Scalp sensitivity or tenderness is a symptom.

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Valley Fever (Coccidioidomycosis)

Coccidioidomycosis, also known as valley fever, is a fungal infection that starts in the lungs and can potentially spread to the rest of the body. Fever, chills and sweating are common.

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Aspergillosis is an infection, allergic reaction, or fungal growth caused by the Aspergillus fungus. The fungus usually grows on decaying vegetation and dead leaves. Being exposed to the fungus does not necessarily mea...

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Addisonian Crisis (Acute Adrenal Crisis)

This condition is considered a medical emergency. Urgent care may be required.

People with Addison's disease don't make enough cortisol or aldosterone. Addisonian crisis is a potentially life-threatening condition indicated by nausea, abdominal pain, fever, and chills.

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Chronic Myelogenous Leukemia (CML)

Leukemia is a type of cancer that starts in the blood or blood-forming tissues. There are many different types of leukemia, and treatment is different for each one. Chronic leukemias are slower growing than acut...

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Acute Lymphocytic Leukemia

Acute lymphocytic leukemia (ALL) is the most common cancer in childhood, although it can also occur in adults. ALL is a cancer of the blood and bone marrow. Cancer occurs when abnormal cells in a part of the body begi...

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Acute Myeloid Leukemia

Acute myeloid leukemia (AML) is a cancer that occurs in the blood and the marrow of the bones. Marrow is sponge-like material inside the bones that produces blood cells. AML specifically affects the white blood cells o...

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Chronic Lymphocytic Leukemia

Leukemia is a type of cancer that affects the blood and blood-forming tissues. There are many types of leukemia, each affecting different kinds of blood cells. Chronic lymphocytic leukemia, or CLL, is a cancer of th...

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.