Can vomiting blood be caused by anything to do with nerves or the head?

I fell on my forehead, and it bled really badly(and needed stitches later on). And then, shortly after, i vomited out all the food that i ate and then vomited out blood.
Could it be because i fell on my head, or gastric/esophagal tear or something?

And is there such a thing as vomiting blood being head/nerve-related?
'Cause my friend also claims she vomits blood quite often, and she hasn't gone to see any doctor and looks perfectly fine and i think she's lying. So i did research about vomiting blood, and found out it mainly has to do with the digestive tract and stuff, so i mentioned it in passing to her, and she's like "oh it's something to do with the nerves in my head" and so i just kept quiet, in case she really does vomit blood.

So long story short, im dying for my questions to be answered pleeease.

it can be a gastro-intestinal problem...such as an ulcer...it has nothing to do with nerves in anyone's head...if your friend tells you this then it is all in her head as in made up...you need to see and Internist...a doctor that specializes in internal medicine

hi
you did reading on it =it is stomache intestinal related or an ulcer=go to a dr or clinic for help

The following medical conditions are some of the possible causes of Vomiting blood. There are likely to be other possible causes, so ask your doctor about your symptoms.

Nose condition
Nosebleed
Prior nosebleed - the blood from a nosebleed may have been swallowed causing later "coffee ground vomit".
Swallowed blood - results in "coffee ground" consistency.
Throat condition (type of Neck conditions)
Blood in sputum - blood from the lungs may have been coughed up and swallowed.
Lung bleeding
Gastrointestinal bleeding
Peptic ulcer
Gastritis
Gastric erosion
Esophageal bleeding (type of Gastrointestinal bleeding)
Esophageal irritation - such as from persistent coughing or other irritations.
Esophagus vein hemorrhage
Cirrhosis of the liver
Chronic hepatitis (type of Hepatitis)
Stomach bleeding (type of Gastrointestinal bleeding) - causing "coffee ground" vomit
Stomach cancer
Certain foods or drinks - may cause reddish color in vomit rather than being blood:
Artificial food colorings
Red or purple foods or drinks
Certain drugs
See also blood in sputum, vomiting, or other bleeding symptoms
Coagulation disorders
Esophageal carcinoma
Esophageal rupture
Ruptured esophageal varices
Gastric carcinoma
Acute gastritis
Mallory-Weiss syndrome
Traumatic NG or endotracheal intubation
Nose surgery
Throat surgery
- (Source - WD writers)

MAYBE YOU HIT YOUR NOSE AND THE BLOOD WAS FROM YOUR NOSE (I MEAN THE SWALLOWED BLOOD-you always swallow some blood if you have a nose bleed), FOREHEAD IS CLOSE TO NOSE, RIGHT? DID YOU JUST VOMIT ONCE? IF IT HAPPENS AGAIN THEN YOU SHOULD ASK THE DOCTOR.

YOUR ANSWER

CALL 911 OR YOUR DOCTOR

PLEASE!!!!!!!!!!!!!!!

Vomiting blood is never a good sign; GI bleeding needs to be checked out, preferrably by a gastroenterologist. Head injury frequently results in vomiting, but not of blood.
Bleeding in the digestive tract can result in anemia. Get yourself to a doctor!