Nearly 70,000 brain cancer cases will be diagnosed this year. More than 4,600 children between the ages of 0-19 are diagnosed each year. The brain and central nervous systems are most common cancers in children in this age range. 

Almost 700,000 people in the U.S. live with brain tumors. There are more than 120 types of brain tumors. Currently, brain tumors are the leading cause of cancer-related deaths in children under age 20 with leukemia being number one. 

The symptoms can often be mistaken for other illnesses. Here's what you need to know. 

More often than not, brain cancer tumors have minimal to no symptoms. This can be very dangerous and some of the symptoms can be mistaken for a minor headache or something less of a risk. 

Most common brain cancer symptoms:

• Headache
• Weakness
• Clumsiness
• Difficulty walking
• Seizures

Nonspecific symptoms and signs of brain tumors include:

• Altered mental status -- changes in concentration, memory, attention, or alertness
• Nausea, vomiting
• Abnormalities in vision
• Difficulty with speech
• Gradual changes in intellectual or emotional capacity

The key is knowing when to seek medical care. If you have any of the following symptoms, it's imperative to see your physician: 

• Unexplained, persistent vomiting
• Double vision or unexplained blurring of vision, especially on only one side
• Lethargy or increased sleepiness
• New seizures
• New pattern or type of headaches

Although headaches are thought to be a common symptom of brain cancer, they may not occur until late in the progression of the disease. For brain tumors, new symptoms or relatively sudden or rapid worsening of symptoms require the patient to go to the hospital immediately. 

Be on the lookout for the following symptoms: 

• Seizures
• Changes in mental status, such as excessive sleepiness, memory problems, or inability to concentrate
• Visual changes or other sensory problems
• Difficulty with speech or in expressing yourself
• Changes in behavior or personality
• Clumsiness or difficulty walking
• Nausea or vomiting (especially in middle-aged or older people)
• Sudden onset of fever, especially after chemotherapy.