Therese Alshammar, a renowned Swedish swimmer, began her journey in the sport at age seven with Sundbybergs IK in Stockholm. Her mother introduced her to swimming, and she instantly enjoyed it. Alshammar competes for Taby Sim Swimming Club in Stockholm and is coached by Johan Wallberg, her partner, and Ulrika Sandmark at the national level.

| Season | Event | Rank |
|---|---|---|
| 2016 | Women's 50m Freestyle | 15 |
| 2012 | Women's 50m Freestyle | 6 |
| 2008 | Women 4 x 100m Freestyle Relay | 11 |
| 2008 | Women's 50m Freestyle | 14 |
| 2004 | Women's 50m Freestyle | 4 |
| 2004 | Women 4 x 100m Freestyle Relay | 7 |
| 2000 | Women 100m Freestyle | S Silver |
| 2000 | Women's 50m Freestyle | S Silver |
| 2000 | Women 4 x 100m Freestyle Relay | B Bronze |
Alshammar's training regime includes pool sessions and pilates. She believes pilates has significantly helped her back and turned injuries into strengths. Her sporting philosophy is encapsulated by her motto: "Balls to the wall." This approach has driven her to excel despite challenges.
Alshammar has faced several injuries throughout her career. She aggravated a back injury in July 2015, causing her to miss the World Championships in Kazan, Russia. Leading up to the 2012 Olympic Games in London, she dealt with herniated discs. Despite these setbacks, she continued to train and compete at a high level.
Alshammar has received numerous accolades. She was named Female Athlete of the Year at the Swedish Sports Gala in 2000 and 2011. In 2010, she was awarded Female Swimmer of the Year by both FINA and LEN. She also received H.M. The King's medal of the 8th size in 2012, among other honours.
Alshammar resides in Stockholm with her partner Johan Wallberg and their son Fred. She speaks English and Swedish fluently. She holds degrees in Design and Journalism from the University of Nebraska-Lincoln in the USA.
Alshammar's silver medal in the 100m freestyle at the 2000 Olympic Games in Sydney was Sweden's first individual Olympic medal by a female swimmer in 40 years. However, she faced disqualification at the world championship trials in Sydney in 2009 for wearing two swimsuits during the 50m butterfly heats.
As of July 2024, Alshammar continues to focus on her swimming career while balancing family life. Her dedication to training and overcoming injuries remains a testament to her resilience and passion for the sport.
Alshammar's journey from a young swimmer introduced by her mother to an internationally recognised athlete is inspiring. Her achievements highlight her commitment and determination to excel despite challenges.
Therese Alshammar, a renowned Swedish swimmer, began her journey in the sport at age seven with Sundbybergs IK in Stockholm. Her mother introduced her to swimming, and she instantly enjoyed it. Alshammar competes for Taby Sim Swimming Club in Stockholm and is coached by Johan Wallberg, her partner, and Ulrika Sandmark at the national level.