In American history, few figures are as dramatically contrasting as John Fitzgerald Kennedy — affectionately known as Jack or JFK. Born into one of the wealthiest and most influential families in Boston, the young boy Jack was a fragile “little warrior” who constantly battled illnesses from his earliest days. Fate seemed to test him with endless hardships, yet those very challenges forged a resilient man, a war hero, and eventually the 35th President of the United States — a symbol of hope and the spirit of the “New Frontier.”
This article is the opening piece of our JFK series, telling the true human story behind the aura of power. It is based on documents from the John F. Kennedy Presidential Library, the Miller Center, and other reputable historical sources.
A Childhood Plagued by Illness in the Legendary Kennedy Clan
John Fitzgerald Kennedy was born on May 29, 1917, at 83 Beals Street in Brookline, Massachusetts. He was the second of nine children born to Joseph Patrick Kennedy Sr., a highly successful businessman, and Rose Fitzgerald Kennedy, a disciplined woman from a prominent political family.
Joseph Kennedy, of Irish immigrant descent, rose to become a millionaire through investments in stocks, Hollywood, and other ventures. He was extremely ambitious and pushed his children to excel in every competition. Rose was the strict family manager who meticulously recorded each child’s health on small notecards.
But Jack was not a healthy child. From an early age, he suffered from whooping cough, measles, chickenpox, ear infections, and more. The family often joked that “any mosquito that bit Jack would probably die from his diseased blood.” The crisis came in 1920 when, not yet three years old, Jack contracted scarlet fever — a dangerous infectious disease that could be fatal at the time. Joseph Kennedy was terrified and stayed by his son’s side at the hospital every day. Fortunately, after more than a month, Jack recovered, but his fragile health would haunt him for the rest of his life.
The Kennedy family moved several times — from Brookline to New York, and later to Hyannis Port, where they owned a seaside vacation home. Life on the surface was luxurious, with sailboats, servants, and elite schools, but inside there was intense competition among the siblings. Older brother Joe Jr. — the one their parents expected to become the first Catholic president — was always the “king” of the family. Jack, though two years younger, was mischievous and intelligent, often challenging his brother. Once, during a bicycle race, the two collided, and Jack needed 28 stitches.
Despite his frailty, Jack participated in sports and studies. He attended prestigious private schools such as Dexter, Canterbury, and Choate Rosemary Hall. At Choate, Jack was known as a fun, popular boy who loved reading (especially history and the New York Times), played tennis, basketball, football, and golf. His grades were average because he wasn’t always diligent, except in subjects he enjoyed. The headmaster once described Jack as having “a personality and independent mind.”
In 1934, while at Choate, Jack was hospitalized again on suspicion of leukemia. It was later diagnosed as colitis. These long hospital stays made him more introspective, leading him to read more and develop a resilient yet somewhat pessimistic spirit.
Harvard, Injuries, and Early Lessons About the World
In 1936, Jack followed his brother Joe to Harvard. Both played football, but Jack was not a star athlete. During one game, he suffered a severe back injury — a herniated disc that would torment him for the rest of his life.
In 1937, his father Joseph was appointed U.S. Ambassador to Britain. The family moved to London, except for Joe and Jack who were still in college. Jack used the opportunity to travel across Europe and witnessed the rising tensions before World War II. He became particularly interested in international politics.
In 1939, Nazi Germany invaded Poland and the war began. As a senior at Harvard, Jack chose to write his thesis on why Britain was unprepared for war. This thesis was later published as the book Why England Slept, which became a bestseller and established Jack’s talent as a writer. His father sent a congratulatory telegram: “Two things I’ve always known about you: you’re smart and you’re a great guy.”
World War II: From a Frail Young Man to the PT-109 Hero
After graduating from Harvard in 1940, both Jack and Joe joined the U.S. Navy. Joe became a pilot, while Jack was given command of PT-109, a fast patrol torpedo boat in the Pacific. Despite his poor health (his father had to pull strings to help him pass the medical exam), he volunteered for dangerous combat duty.
On the night of August 2, 1943, in Blackett Strait near the Solomon Islands, PT-109 was on patrol when it was rammed by the Japanese destroyer Amagiri in the darkness. The boat split in two, two crew members were killed, and the rest jumped into the sea. Jack was thrown hard and suffered intense back pain. Crewman Patrick McMahon was badly burned and nearly gave up.
With natural leadership, Lieutenant Kennedy searched for his men in the water. He towed the severely burned McMahon by gripping the strap of his life jacket with his teeth and swam for hours in the dark to a small island several miles away. For the next six days, they drifted, hungry and thirsty, hiding from Japanese forces. Jack swam out to sea multiple times seeking rescue and carved a message on a coconut shell that was delivered by two local islanders. Eventually, the entire crew was rescued alive.
This courageous action earned Kennedy the Navy and Marine Corps Medal for “courage, endurance, and outstanding leadership.” He also received the Purple Heart for his injuries. When asked how he became a hero, Jack joked: “It was easy — they sank my boat.”
Family tragedy continued: Older brother Joe Jr. was killed in 1944 during a dangerous mission. Joe’s death — the son their father had pinned all presidential hopes on — shifted the burden onto Jack’s shoulders.
Entering Politics and “Profiles in Courage”
After the war, Jack worked briefly as a journalist for Hearst Newspapers. In 1946, at age 29, he ran for and won a seat in the U.S. House of Representatives representing a Boston district. He served three terms before defeating Senator Henry Cabot Lodge Jr. in 1952 to become a U.S. Senator.
His health remained a constant enemy. In 1954–1955, Jack underwent dangerous spinal surgery. While recovering in the hospital, he wrote the book Profiles in Courage — portraits of eight U.S. senators who dared to stand up for their principles despite risking their careers. Published in 1956, it became a bestseller and won the Pulitzer Prize in 1957 (though there was controversy over the role of ghostwriter Ted Sorensen).
The book was not only a literary achievement but also reflected Kennedy’s philosophy: True leadership means being willing to sacrifice for what is right.
Conclusion: From Trials to Legacy
The journey from a frail boy who nearly died of scarlet fever, through war injuries, to becoming a war hero and talented politician shows that John F. Kennedy was a man of extraordinary willpower. The wealth of his family gave him privileges, but it was his personal suffering that shaped him into someone capable of empathy and inspiration.
Jack often said that fate tests people to prepare them for greater missions. And his later mission was to lead America through the turbulent years of the Cold War with the famous call: “Ask not what your country can do for you — ask what you can do for your country.”