poor comprehension

difficulty walking, headache, poor coordination, vision problems

Head injury is a trauma to the head, that may or may not include injury to the brain (see also brain injury). ... 

puffy face, stomach pain, upper abdominal pain, vomiting

headache, poor appetite, vomiting, weakness

Encephalitis is an acute inflammation of the brain, commonly caused by a viral infection. Sometimes, encephalitis can result from a bacterial infection, such as bacterial meningitis, or it may be a complication of other infectious diseases like rabies (viral) or syphilis (bacterial). ... 

convulsions, paralysis, passing out, weakness

A complex partial seizure is an epileptic attack that involves a greater degree of impairment or alteration of consciousness/awareness and memory than a simple partial seizure. ... 

headache, poor coordination, vision problems, vomiting

A brain tumor is any intracranial tumor created by abnormal and uncontrolled cell division, normally either found in the brain itself (neurons, glial cells (astrocytes, oligodendrocytes, ependymal cells), lymphatic tissue, blood vessels), in the cranial nerves (myelin-producing Schwann cells), in the brain envelopes (meninges), skull, pituitary and pineal gland, or spread from cancers primarily located in other organs (metastatic tumors). Primary (true) brain tumors are commonly located in the posterior cranial fossa in children and in the anterior two-thirds of the cerebral hemispheres in adults, although they can affect any part of the brain. ... 

dizziness, fever, passing out, poor appetite

Septic shock is a serious medical condition caused by decreased tissue perfusion and oxygen delivery as a result of infection and sepsis. It can cause multiple organ failure and death. Its most common victims are children, immunocompromised individuals, and the elderly, as their immune systems cannot cope with the infection as well as those of full-grown adults. The mortality rate from septic shock is approximately 50%. ... 

dizziness, headache, vision problems, vomiting

stomach swelling, swollen feet, swollen feet and legs, yellow color of skin or eyes

Liver failure is the inability of the liver to perform its normal synthetic and metabolic function as part of normal physiology. Two forms are recognised: ... 

confusion, fever, headache, vomiting

Brain abscess (or cerebral abscess) is an abscess caused by inflammation and collection of infected material coming from local (ear infection, infection of paranasal sinuses, infection of the mastoid air cells of the temporal bone, epidural abscess) or remote (lung, heart, kidney etc.) infectious sources within the brain tissue. The infection may also be introduced through a skull fracture following a head trauma or surgical procedures. Brain abscess is usually associated with congenital heart disease in young children. It may occur at any age but is most frequent in the third decade of life. ... 

convulsions, flushing of face, headache, vision problems

Focal seizures (also called partial seizures) are seizures which are characterized by: ...