Why do some people get side effects after COVID-19 vaccines?

A health care worker prepares a dose of the Pfizer COVID-19 (coronavirus) vaccine at a Los Angeles County mobile vaccination clinic. (File/AFP)
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Updated 10 June 2021
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Why do some people get side effects after COVID-19 vaccines?

  • Temporary side effects include headache, fatigue and fever
  • Not all side effects are routine

Why do some people get side effects after COVID-19 vaccines?

Temporary side effects including headache, fatigue and fever are signs the immune system is revving up — a normal response to vaccines. And they’re common.

“The day after getting these vaccines, I wouldn’t plan anything that was strenuous physical activity,” said Dr. Peter Marks, the US Food and Drug Administration’s vaccine chief, who experienced fatigue after his first dose.

Here’s what’s happening: The immune system has two main arms, and the first kicks in as soon as the body detects a foreign intruder. White blood cells swarm to the site, prompting inflammation that’s responsible for chills, soreness, fatigue and other side effects.

This rapid-response step of your immune system tends to wane with age, one reason younger people report side effects more often than older adults. Also, some vaccines simply elicit more reactions than others.

That said, everyone reacts differently. If you didn’t feel anything a day or two after either dose, that doesn’t mean the vaccine isn’t working.

Behind the scenes, the shots also set in motion the second part of your immune system, which will provide the real protection from the virus by producing antibodies.

Another nuisance side effect: As the immune system activates, it also sometimes causes temporary swelling in lymph nodes, such as those under the arm. Women are encouraged to schedule routine mammograms ahead of COVID-19 vaccination to avoid a swollen node being mistaken for cancer.

Not all side effects are routine. But after hundreds of millions of vaccine doses administered around the world — and intense safety monitoring — few serious risks have been identified. A tiny percentage of people who got vaccines made by AstraZeneca and Johnson & Johnson reported an unusual type of blood clot. Some countries reserved those shots for older adults but regulatory authorities say the benefits of offering them still outweigh the risks.

People also occasionally have serious allergic reactions. That’s why you’re asked to stick around for about 15 minutes after getting any type of COVID-19 vaccine — to ensure any reaction can be promptly treated.

Finally, authorities are trying to determine whether temporary heart inflammation that can occur with many types of infections also might be a rare side effect after the mRNA vaccines, the kind made by Pfizer and Moderna. US health officials can’t yet tell if there’s a link but say they’re monitoring a small number of reports, mostly male teens or young adults.


Bangladesh halts controversial relocation of Rohingya refugees to remote island

Updated 29 December 2025
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Bangladesh halts controversial relocation of Rohingya refugees to remote island

  • Administration of ousted PM Sheikh Hasina spent about $350m on the project
  • Rohingya refuse to move to island and 10,000 have fled, top refugee official says

DHAKA: When Bangladesh launched a multi-million-dollar project to relocate Rohingya refugees to a remote island, it promised a better life. Five years on, the controversial plan has stalled, as authorities find it is unsustainable and refugees flee back to overcrowded mainland camps.

The Bhasan Char island emerged naturally from river sediments some 20 years ago. It lies in the Bay of Bengal, over 60 km from Bangladesh’s mainland.

Never inhabited, the 40 sq. km area was developed to accommodate 100,000 Rohingya refugees from the cramped camps of the coastal Cox’s Bazar district.

Relocation to the island started in early December 2020, despite protests from the UN and humanitarian organizations, which warned that it was vulnerable to cyclones and flooding, and that its isolation restricted access to emergency services.

Over 1,600 people were then moved to Bhasan Char by the Bangladesh Navy, followed by another 1,800 the same month. During 25 such transfers, more than 38,000 refugees were resettled on the island by October 2024.

The relocation project was spearheaded by the government of former Prime Minister Sheikh Hasina, who was ousted last year. The new administration has since suspended it indefinitely.

“The Bangladesh government will not conduct any further relocation of the Rohingya to Bhasan Char island. The main reason is that the country’s present government considers the project not viable,” Mizanur Rahman, refugee relief and repatriation commissioner in Cox’s Bazar, told Arab News on Sunday.

The government’s decision was prompted by data from UN agencies, which showed that operations on Bhasan Char involved 30 percent higher costs compared with the mainland camps in Cox’s Bazar, Rahman said.

“On the other hand, the Rohingya are not voluntarily coming forward for relocation to the island. Many of those previously relocated have fled ... Around 29,000 are currently living on the island, while about 10,000 have returned to Cox’s Bazar on their own.”

A mostly Muslim ethnic minority, the Rohingya have lived for centuries in Myanmar’s western Rakhine state but were stripped of their citizenship in the 1980s and have faced systemic persecution ever since.

In 2017 alone, some 750,000 of them crossed to neighboring Bangladesh, fleeing a deadly crackdown by Myanmar’s military. Today, about 1.3 million of them shelter in 33 camps in the coastal Cox’s Bazar district, making it the world’s largest refugee settlement.

Bhasan Char, where the Bangladeshi government spent an estimated $350 million to construct concrete residential buildings, cyclone shelters, roads, freshwater systems, and other infrastructure, offered better living conditions than the squalid camps.

But there was no regular transport service to the island, its inhabitants were not allowed to travel freely, and livelihood opportunities were few and dependent on aid coming from the mainland.

Rahman said: “Considering all aspects, we can say that Rohingya relocation to Bhasan Char is currently halted. Following the fall of Sheikh Hasina’s regime, only one batch of Rohingya was relocated to the island.

“The relocation was conducted with government funding, but the government is no longer allowing any funds for this purpose.”

“The Bangladeshi government has spent around $350 million on it from its own funds ... It seems the project has not turned out to be successful.”