Due to diligence in preparing for the visa process, not bringing all the necessary documents to the interview/ appointment can cause a rejection / delay in your case. Though the Visa officer may not ask for the documents, but it is always advisable to carry all your documents along.
Reason to return back to home country not strong enough
If you’re applying for student visa, you have to prove that you are definitely going to return to your home country after your education / internship. Inability to convince the Visa officer of your returning will most likely lead to rejection. Let the immigration officer knows that you have a secure a family future (maybe some estate and properties), that you own and require your attention back in the country.
Being overly confident during the interview
Try not to present yourself as a ‘know-it-all’ or ‘wise guy.’ Expressing extreme confidence of a visa approval / Being too assertive on all aspects of the visa process or can make you come off as presumptuous and arrogant.
Giving too much information
You will be asked an array of questions. Your responses should be well-thought-out, but keep them concise and simple. Giving too much divulge irrelevant details that don’t pertain directly to the inquiry leads for red flags.
Overstay or violated US visa conditions on your previous visit
If you have visited USA already and has experienced some legal and overstay issues during your stay in the US, then the consular can reject your visa this time. Not following the designated itinerary or visa duration in the US without authorization are few reasons for US visa rejection.
Visa Denials Based on Criminal Record
If you have a connection with radical groups or has criminal record or history of espionage or any links , there is a strong chance of you facing a US Visa rejection. Not every crime will result to denial, but some can,and the list can be difficult to interpret.
Don’t hesitate to ask the interviewer for an interpreter or to repeat, explain, or slow down. Effective communication can help avoid potentially significant misunderstandings and misinterpretations.
Visa Denials Based on Fraud
Looking at the rigid US visa criteria, some applicants uses fake documents to cover up certain facts. The US Embassy follows a strict verification process and any lie or fraud, if discovered will lead to a denial.