WORSE ASTHMA; RED SPOTS ON ARMS/LEG/CHEST/CHIN/NECK; CONSTRICTING  PUPILS; DILATED PUPILS; SEVERE MIGRAINE; BLACK SPOTS IN VISION; NECK PAIN; LIGHT-HEADEDNESS; NECK WEAKNESS; NAUSEOUS; LIGHT BRUISING ON LEG/ARM; FELT LIKE HIT BY MACK TRUCK; SEVERE ABDOMINAL PAIN; FATIGUE; ALLERGIC REACTION; This spontaneous report received from a patient concerned a 21 year old female. The patient's height, and weight were not reported. The patient's concurrent conditions included asthma.  The patient received covid-19 vaccine ad26.cov2.s (suspension for injection, route of admin not reported, batch number: 1808609, and expiry: unknown) dose was not reported, 1 total administered on 20-MAR-2021 to right arm for prophylactic vaccination.  Concomitant medications included omeprazole for abdominal pain.  On 20-MAR-2021 two minutes after the vaccination, the patient had allergic reaction started with itching and redness on arms and upper chest. After ten minutes, the patient felt something wrong and consulted onsite EMT(emergency medical technician). Later the redness turned to hives with itchy to burning sensation. The EMT (emergency medical technician) was given intravenous Benadryl to the patient and hives got disappeared and redness remained. On the same day the patient went to the Emergency Room(ER) and stayed around seven hours. Pepcid and prednisone was given to the patient in ER (Emergency Room). The patient experienced chest tightness and warm and again Benadryl administered to the patient. The patient was also given Epipen while going home. On 21-MAR-2021, the patient experienced fatigue. On 22-MAR-2021, the patient had severe abdominal pain with 7-8 on pain scale, the abdominal pain was lasted for 24 hours and went away. The patient has been on Prilosec for the abdominal pain since a month. On 26- MAR-2021, the patient felt like hit by mack truck and fatigue. On 29-MAR-2021, the patient experienced light bruising legs far more easily than usual and had a bruise where she wore watch, but it was not deep bruising. On 05-APR-2021, the patient experienced black spot on vision in both eyes around 18:00-19:00 at night until went to bed, and lasted for 4 days. On 05-APR-2021, the patient experienced lightheaded and motion sickness when sitting or standing still; the patient also had neck pain. The patient's neck weakness was felt like the patient's head was going to fall off. The patient experienced neck weakness about once in a week around 15 minutes and also felt nauseous. On 09-APR-2021, the patient had severe migraine with light and sound sensitivity and had rapidly dilating pupils. The patient administered cocktail of medicine Benadryl, Toradol, and Compazine and this medicines helped the patient little bit with the pain. On 9-APR-2021, the patient experienced trouble reading for 2 days due to the dilatation of the both eyes. On an unspecified date, the patient experienced worse asthma than usual, and red spots on arms, leg, chest, chin, and neck. The spots were darker and shinier than usual. Other treatment medications (dates unspecified) included: Medrol for migraine. The patient had visited emergency room for allergic reaction. The action taken with covid-19 vaccine ad26.cov2.s was not applicable. The patient recovered from black spots in vision on 09-APR-2021, constricting pupils, and dilated pupils on 10-APR-2021, and severe abdominal pain on 23-MAR-2021, had not recovered from fatigue, light-headedness, nauseous, neck pain, severe migraine, light bruising on leg/arm, worse asthma, red spots on arms/leg/chest/chin/neck, and neck weakness, and the outcome of allergic reaction and felt like hit by a truck was not reported. This report was serious (Other Medically Important Condition).; Sender's Comments: V0: 20210436540-covid-19 vaccine ad26.cov2.s-Allergic reaction. This event(s) is labeled per RSI and is therefore considered potentially related.