Effects of MHD activities on the pressure profile in NBI plasmas in the range of ⟨β⟩⩽3% have been investigated in Large Helical Device (LHD). The ⟨β⟩ dependence of the n/m = 1/2 mode in the core region and the ι = 1 resonant modes in the peripheral region are focused. The n/m = 1/2 mode has been observed in the ⟨βdia⟩ range of less than 2.3% and disappears when the plasma reaches the Mercier stable region. The pressure profile becomes broader with increasing ⟨β⟩, and a large pressure gradient forms in the peripheral region. The amplitudes of the ι = 1 resonant modes in the peripheral region increase monotonically with ⟨β⟩.