Many things can affect how your body responds to a symptom and what kind of care you may need. These include:

• Your age. Babies and older adults tend to get sicker quicker.
• Your overall health. If you have a condition such as diabetes, HIV, cancer, or heart disease, you may need to pay closer attention to certain symptoms and seek care sooner.
• Medicines you take. Certain medicines, such as blood thinners (anticoagulants), medicines that suppress the immune system like steroids or chemotherapy, herbal remedies, or supplements can cause symptoms or make them worse.
• Recent health events, such as surgery or injury. These kinds of events can cause symptoms afterwards or make them more serious.
• Your health habits and lifestyle, such as eating and exercise habits, smoking, alcohol or drug use, sexual history, and travel.

Temperature varies a little depending on how you measure it. For adults and children age 12 and older, these are the ranges for high, moderate, and mild, according to how you took the temperature.

Oral (by mouth) temperature

• High: 104°F (40°C) and higher
• Moderate: 100.4°F (38°C) to 103.9°F (39.9°C)
• Mild: 100.3°F (37.9°C) and lower

A forehead (temporal) scanner is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.

Ear temperature

• High: 105°F (40.6°C) and higher
• Moderate: 101.4°F (38.6°C) to 104.9°F (40.5°C)
• Mild: 101.3°F (38.5°C) and lower

Armpit (axillary) temperature

• High: 103°F (39.5°C) and higher
• Moderate: 99.4°F (37.4°C) to 102.9°F (39.4°C)
• Mild: 99.3°F (37.3°C) and lower

Certain health conditions and medicines weaken the immune system's ability to fight off infection and illness. Some examples in adults are:

• Diseases such as diabetes, cancer, heart disease, and HIV/AIDS.
• Long-term alcohol and drug problems.
• Steroid medicines, which may be used to treat a variety of conditions.
• Chemotherapy and radiation therapy for cancer.
• Other medicines used to treat autoimmune disease.
• Medicines taken after organ transplant.
• Not having a spleen.

Symptoms of diabetes may include:

• Increased thirst and more frequent urination, especially at night.
• An increase in how hungry you are.
• Losing or gaining weight for no clear reason.
• Unexplained fatigue.
• Blurred vision.

A severe urgency problem means that:

• You are uncomfortable most of the time.
• You get the urge to go again right after you have just urinated.
• The problem interferes with your daily activities.
• The urge keeps you from sleeping at night.

A moderate or mild urgency problem means that:

• The urge to urinate comes more often than you are used to, but it is not constant.
• It does not interfere much with your daily activities.
• It usually does not keep you from sleeping.

Pain in adults and older children

• Severe pain (8 to 10): The pain is so bad that you can't stand it for more than a few hours, can't sleep, and can't do anything else except focus on the pain.
• Moderate pain (5 to 7): The pain is bad enough to disrupt your normal activities and your sleep, but you can tolerate it for hours or days. Moderate can also mean pain that comes and goes even if it's severe when it's there.
• Mild pain (1 to 4): You notice the pain, but it is not bad enough to disrupt your sleep or activities.

If you're not sure if a fever is high, moderate, or mild, think about these issues:

With a high fever:

• You feel very hot.
• It is likely one of the highest fevers you've ever had. High fevers are not that common, especially in adults.

With a moderate fever:

• You feel warm or hot.
• You know you have a fever.

With a mild fever:

• You may feel a little warm.
• You think you might have a fever, but you're not sure.

Many prescription and nonprescription medicines can cause urinary symptoms. A few examples include:

• Antihistamines.
• Blood thinners (anticoagulants).
• Decongestants.
• Opioid pain medicines.
• Tricyclic antidepressants.

It is easy for your diabetes to become out of control when you are sick. Because of an illness:

• Your blood sugar may be too high or too low.
• You may not be able take your diabetes medicine (if you are vomiting or having trouble keeping food or fluids down).
• You may not know how to adjust the timing or dose of your diabetes medicine.
• You may not be eating enough or drinking enough fluids.

An illness plan for people with diabetes usually covers things like:

• How often to test blood sugar and what the target range is.
• Whether and how to adjust the dose and timing of insulin or other diabetes medicines.
• What to do if you have trouble keeping food or fluids down.
• When to call your doctor.

The plan is designed to help keep your diabetes in control even though you are sick. When you have diabetes, even a minor illness can cause problems.