Symptoms of fluid on the brain include headache, nausea, vomiting, confusion and vision problems, according to the Brain and Spine Foundation. Symptoms vary depending on the age of the patient at the onset of the condition, explains Mayo Clinic.
In infants, symptoms of fluid on the brain include a bulging fontanelle and rapid increase in the circumference of the head, explains Healthline. Other symptoms include seizures and eyes that look down. Symptoms in toddlers and older children include unstable balance, seizures, abnormal enlargement of the head, nausea and sleepiness, reports Mayo Clinic. Behavioral and cognitive symptoms include low attention span, declining school performance and irritability. Additional symptoms in adults include balance problems, poor coordination and urinary incontinence.