Flu symptoms tend to hit suddenly. You might have some or all these signs:
- Sore throat
- Runny or stuffy nose
- Body or muscle aches
- Vomiting and diarrhea
But other health conditions can bring on the same. So how can you tell if it’s the flu or something else? Your doctor would need to do tests to know for sure. But here are a few conditions that also cause flu-like symptoms.
The Common Cold
Like the flu, a cold can wear you down and make you cough, sneeze, and cause a sore throat. Still, a few key clues may help you tell these viral illnesses apart. Colds usually come on slowly, and the symptoms tend to be milder. You’re more likely to get a runny or stuffy nose. But you’re far less likely to run a fever or have body aches.
This highly contagious and potentially deadly disease is caused by a different virus than the flu. Both COVID and the flu spread from person to person, mainly through:
- Talking close to someone else
And they both can lead to life-threatening health problems, like pneumonia and respiratory failure. But there are important differences. COVID-19 appears to:
- Spread more easily than the flu
- Make you contagious longer than the flu does
- Cause worse illnesses in some people
The virus that causes AIDS can bring on flu-like symptoms about 2 to 4 weeks after you get infected. Some of the early possible signs of an HIV infection are:
- Fever and chills
- Muscle pain
- Sore throat
HIV infection can also cause unrelated symptoms, like:
- Muscle soreness
Unlike the flu, Lyme disease can cause a rash where the tick bit you. It may be shaped like a bull’s-eye with one or more reddish rings. Some people with Lyme disease also have drooping of the face, or Bell’s palsy.
- Achy muscles
Encephalitis can also bring on:
- Agitated feelings
- Loss of feeling or movement in certain body parts
- Trouble talking or hearing
- Unconsciousness or coma
Babies or young children with encephalitis may also have symptoms like:
- Stiff body
- Not feeding much or not waking up to feed
- Throwing up
- Cranky behavior
- Bulges in soft parts of the baby’s skull
This condition inflames the thin coverings that protect your brain and spinal cord. The flu virus is one of several things that can lead to meningitis, including other viruses and bacteria.
Some of the early symptoms of meningitis can seem like the flu. For instance, you may run a sudden high fever and get a headache with nausea or vomiting.
Other meningitis symptoms include:
These common viruses aren’t the same as the ones that cause the flu, but they can bring on flu-like symptoms. Both illnesses can lead to health problems like pneumonia and bronchitis, too.
Adenoviruses can cause pinkeye and (less often) bladder infections. They can also trigger conditions that affect the brain and spine. Although the two infections spread similarly, adenoviruses may cling to commonly touched surfaces longer. Disinfectants may not fight them as well.
This common lung infection can range from mild to severe. The flu virus is one of several things, including bacteria and fungi, that can cause it. The symptoms can look a lot alike. With pneumonia, you could have a cough, fever, chills, fatigue, and trouble breathing.
But pneumonia doesn’t come on as fast as the flu, and it’s not likely to make your muscles ache. You’re more likely to have these symptoms, too:
Carbon Monoxide (CO) Poisoning
This can happen when carbon monoxide gas builds up indoors and makes you sick when you breathe it in. It can set off tiredness, nausea or vomiting, dizziness, and headache. Carbon monoxide poisoning is an emergency. If you breathe in too much, you could pass out and die.
Buying a carbon monoxide detector and getting a technician to check your heating systems and fuel-burning appliances once a year are two things you can do to make your home safer.