Register,update user information and send data to two tables at the same time in laravel 5.1

I need to register a new user and store data in two tables separately, the Users table will hold classic id /name / email / password information while the doctor table will hold different information related to the new registered user, for example gender, age, user_pic etc. I also need to edit the user info & save the value in two tables.How can I achieve this.Thanks. My route file is

Route::group([
    'middleware' => 'auth'
    ], function() {


        Route::get('/home', [
        'as' => 'admin',
        'uses' => 'AdminController@index'
    ]);

        Route::get('/profile', array('as' =>'profile' ,'uses' => 'ProfileController@index'));

    //     Route::get('/profile/{profile_id}',[
    //     'as' => 'profile',
    //     'uses' => 'ProfileController@index'
    // ]);

        Route::get('/mail',[
        'as' => 'mail',
        'uses' => 'MailController@index'
    ]);

    });

My Doctor Model is

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Doctor extends Model
{
    protected $fillable = [
        'name',
        'division_id',
        'district_id',
    ];

    public function district()
    {

        return $this->belongsto('App\District');
    }
    public function division()
    {

        return $this->belongsto('App\Division');
    }
}

via Chebli Mohamed