Protests marking the fifth anniversary of a historic strike in Mahalla left 46 people injured across Egypt on Saturday.
Fourty were injured in Cairo and six more in Fayoum and El-Gharbiya, the health ministry announced.
The protests were organised by the April 6 Youth Movement which was founded to support textile workers in Mahalla who began a strike on 6 April 2008.
The Constitution Party, the Alliance of Revolutionary Forces, and the Free Egyptians Party joined the protests which also condemned the policies of President Mohamed Morsi.
Police began firing teargas at protesters late Saturday evening from inside the High Court in Cairo after protesters gathered at the building, banged on the door and set off fireworks.
Clashes at the court had subdued by early Sunday.