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Your symptoms:
  • Diarrhea
  • Headache

What causes diarrhea and headache? 24 possible conditions

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

1

Food Poisoning

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

Food poisoning occurs when you consume foods contaminated with bacteria, viruses, or parasites. Symptoms are usually uncomfortable but not severe.

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2

Giardiasis

Giardiasis is an infection in your small intestine caused by microscopic parasites called giardia.

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3

PMS (Premenstrual Syndrome)

Premenstrual syndrome causes a wide variety of emotional and physical symptoms. Learn more about it.

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4

Shigellosis

Shigellosis is a bacterial infection that affects the digestive system. The Shigella bacterium is spread through contact with contaminated feces.

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5

Swine Flu

Swine flu, or H1N1, is highly contagious and can spread quickly from person to person. A simple sneeze may cause thousands of germs to spread through the air. Symptoms are similar to regular influenza.

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6

Allergies Overview

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

Learn about what causes allergies, the different types of allergies, and how they're treated.

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7

The Atypical Facts About Atypical Pneumonia

Pneumonia is an infection that causes inflammation of the lungs. Atypical pneumonia is a kind that isn't caused by the bacteria that causes typical pneumonia.

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8

Painful Menstrual Periods

Menstruation is a monthly occurrence for women in which the body sheds the lining of the uterus (womb), which is then passed through a small opening in the cervix and out through the vaginal canal.

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9

Caffeine Overdose

The recommended amount of caffeine is usually 400 mg per day for healthy adults. Caffeine overdose may occur if you ingest more than this amount.

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10

Legionnaires' Disease

Legionnaires' disease is a severe type of pneumonia, or lung infection. Learn about its symptoms, causes, treatment, and prevention.

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11

Toxic Shock Syndrome

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

Toxic shock syndrome is a rare but serious condition caused by a bacterial infection. Read more about its causes and symptoms and when to see a doctor.

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12

Weils Disease

Weil's disease is a severe form of the bacterial infection leptospirosis. Learn how to lower your risk of getting this potentially life-threatening illness.

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13

West Nile Virus Infection (West Nile Fever)

Learn about the causes and symptoms of the West Nile virus.

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14

Absence of Gamma Globulin in Blood

Agammaglobulinemia is an inherited immune system disorder in which the body is unable to produce antibodies.

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15

Ebola Virus and Disease

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

Ebola disease is a rare, often fatal illness. One of its late-stage symptoms is a bleeding rash over the entire body.

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16

Anthrax

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

Anthrax is a serious illness caused by a microbe called Bacillus anthracis that lives in soil. Read about the symptoms of anthrax.

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17

Bird Flu

Bird flu, also called avian influenza, is a viral infection that can also infect humans and other animals.

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18

Megaloblastic Anemia

Megaloblastic anemia is a blood disorder marked by the appearance of very large red blood cells that crowd out healthy cells, causing anemia.

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19

Fifth Disease

Fifth disease is common in children. It causes a red rash on the arms, legs, and cheeks, and a virus called parvovirus B19 causes it.

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20

SARS (Severe Acute Respiratory Syndrome)

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

Severe acute respiratory syndrome (SARS) is a serious form of viral pneumonia. The virus that causes SARS was first identified in 2003.

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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.
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