It is quite possible to suffer from these two symptoms (headache and fever) at the same time
The causes of these symptoms are infection, allergy, side effect of medication and other problems.
Both adults and children can have headache and fever.
In some clinical cases, these symptoms are a kind of signal that the body is fighting a much more serious infection or disease.
Medical intervention is necessary for the following symptoms:
- High fever (39.4 and above);
- Severe headache;
- Rashes;
- Neck pain or stiffness;
- Shortness of breath;
- Stomach-ache;
- Pain during urination;
- Confusion;
- Frequent vomiting;
- Attack or heart attack.
If the child develops fever and headache after vaccination, immediately contact the clinic in case of these symptoms:
- The baby is up to 12 weeks old;
- Burning of the neck;
- It is difficult to move the neck normally;
- Cry for more than 3 hours;
- They do not react to stimuli or your conversation or cry.
Be sure to consult a pediatrician if the child suffers from the following symptoms:
- Fever lasts longer than 3 days;
- The redness around the immunization injection is larger than 7 centimeters;
- Redness or some kind of red streaks appeared on the skin 2 days after immunization;
- They touch the ear;
- Swelling (like a lump) or moles in any part of the body.
Source:
https://www.healthline.com/health/headache-and-fever
