I am 24 year old and i have white patches in my mouth from 4 months. now i am worried. is it a symptoms of oral cancer or else. what is better option.

White Patches: White patches in the mouth can be from a variety of causes including bite trauma, irritations from a poorly fitting dental appliance, overgrowth of a fungus called candida albicans, leukoplakia, which is common in tobacco users, or in rare cases, a form of oral cancer. Let a dentist, who is a specialist in diseases of the mouth examine you to determine the nature of your white patches.

Candidiasis: If the white lesion can be removed by scraping it may be Candida Albicans or a fungal infection. It is often seen in patient's that are immunocompromised. If your immune system was weakened recently or if you have lupus or aids, then oral thrush can develop. White lesions with red on the sides of the tongue are more suspicious of oral cancer. You would sometimes feel pain with these lesions.

Sadly impossible: To render a diagnosis over the internet. Best to be evaluated by a dentist or by your physician. Hope this helps.