[1] She was the daughter of customs administrator Jan Otto Granström and Maria Elisabeth Wiliamson and spent her early years in Gothenburg as well as in Marstrand and Sölvesborg.

[1] She was a student at the Kjellbergska flickskolan (Kjellbergska girls' school) in Gothenburg, and she was a teacher for five years before taking her matriculation exam as a private practitioner in Lund in 1886, becoming a medical candidate at the Karolinska Institute in Stockholm in 1892 and a medical licentiate there in 1897.

She was a suffragist and a member of the Gothenburg branch of the National Association for Women's Suffrage (Sweden).

[1] On 19 December 1897, she married fellow medicine licentiate Pontus Erland Wigardh (1866–1907) but he died only a decade later after an illness.

[1] In 1933, Thora Wigardh died and was buried in the family gravesite in the Eastern cemetery, Gothenburg.